The most conspicuous feature of the great hornbill is its casque, a hollow structure located on top of the massive bill.  When viewed from the front the casque is U-shaped, with two ridges along the sides that form points in the front and give the species its Latin name bicornis, meaning two-horned.

Classification

CLASS:Aves
ORDER:Coraciiforme
FAMILY:Bucerotidae
GENUS:Buceros
SPECIES:bicornis

Habitat & Range

Great hornbills reside in wet evergreen and deciduous old growth forests at elevations of 600 to 2000 meters (1968.5 to 6561 feet).  For nesting, they prefer trees that tower above the canopy level.

The great hornbill is found in forests in mainland Southeast Asia, including  Bhutan, Nepal, southwest China, southwest and Himalayan India, Cambodia, Laos, Myanmar, Thailand , Vietnam .  Some populations still exist on the Malay Peninsula and the island of Sumatra.

Location

Adaptations

  • The species’ most striking adaptation is the hollow casque, but its function is not precisely known.  It may serve to attract females, to dominate other males, or to serve as a resonance chamber that amplifies the sounds the birds make.  The size and color are also an indication of the age of the bird.
  • The first two cervical (neck) vertebrae are fused to help support the birds’ large bills.
  • The sealing of the nest by the female is thought to have evolved as a predator deterrent. It may also ensure the male’s fidelity to the nest, female and young.
  • Great hornbills are highly vocal.  Pairs use duets as part of courtship, and the birds call loudly and frequently within their large, communal night roosts.
  • This species never needs to drink but obtains the water it needs from its diet.

Physical Description

  • The great hornbill is one of the largest hornbills, weighing on average 3 kg (6.6 pounds) and ranging in length from 95 to 120 cm (37.4 to 47.24 in.) with a wingspan of 151 to 178 cm (59 to 70 inches).
  • They are vividly colored.  The body, head and wings are mostly black; the abdomen and neck are white. The tail is white with a black band.  A preen gland near the tail secretes tinted oil, spread by the bird during grooming, which may give the bill, neck, tail and wing feathers a color varying from yellow to red.
  • The most conspicuous feature of the great hornbill is its casque, a hollow structure located on top of the massive bill.  When viewed from the front the casque is U-shaped, with two ridges along the sides that form points in the front and give the species its Latin name bicornis, meaning two-horned.
  • Males and females have identical plumages, but the female is smaller and has a bluish-white iris, while the male’s is red.  The back of the casque is reddish in females and the underside of the front and back of the casque is black in males.
  • They lack the short feathers under the wing (underwing coverts) that cover the bases of the primary and secondary flight feathers in other birds.  As a result, their flight is often noisy and produces a characteristic “whooshing” sound.
  • Like many other hornbills, great hornbills have prominent eyelashes on their upper eyelids.

Diet

What Does It Eat?

In the wild:
Great hornbills primarily (70%) eat fat-rich and sugar-rich fruits, but they also feed on small mammals, birds, eggs, amphibians, reptiles and insects.  Figs are a particularly important food throughout the year.  This species has been known to protect fig trees from other birds.

At the zoo:
They eat iron-rich fruits, bird pellets and super worms.

What Eats It?
Man is the chief predator of great hornbills.  Tribal members hunt them for their beaks and head to use in charms. The flesh is believed to be medicinal by some. They are also hunted for their fat, which is highly prized and is used for a variety of purposes, from medical treatment to gun polish, and for their casques, meat and feathers, which are used in various rituals.

Social Organization

Great hornbills form monogamous, territorial pairs but may also be seen in small family groups or flocks of up to 40 birds.  Group courtship displays involving up to 20 birds have been observed.  Groups of birds will sometimes gather together at fruit trees.  At night they gather in large communal roosts which may contain hundreds of individuals.  At these roosts the birds are highly vocal, making sounds that can be described as “cackling” or “roaring.” The roosts may function as information hubs, where individual birds share information regarding feeding sites, for example.  Pairs generally mate for life

Life Cycle

Great hornbills breed from January/February to May/June.  Prior to the breeding season males fight each other by butting their casques, often in flight, possibly in competition for females.  A pair will perform duets as part of courtship, wherein a male and female alternate calls to each other.  They select a nest cavity in a large tree. When the female is ready to lay her eggs, she seals herself into the nest cavity using feces, food debris, and wood to cover the entrance from the inside.  She leaves a small slit through which the male feeds her while she lays one or two eggs and incubates them for 38-40 days.  During this time the female completes a full molt.  Although she typically lays 2 eggs, usually only one chick hatches.  When the chick is about 5 weeks old the female emerges from the nest and helps the male feed it.  The chick re-plasters the nest entrance and is fed through the slit for another two weeks.  After the chick emerges, the parents continue to feed it until it is about 15 weeks old, when it becomes independent.  The young birds do not have a casque initially but start to grow one at about 6 months of age. Full development of the casque takes 5 years.  The size of the casque may be important in female selection of a mate.  Great hornbills can live 50 years under human care but average 35-40 years in the wild.

Lorikeet

Tricholglossus

Lorikeet species tend to form monogamous pairs, mating for life. Pairs groom one another while resting. They live in noisy flocks that can include several species and range in size from several pairs to hundreds depending on the abundance of food. They are very active and vocal, screeching as they fly through the canopy and chattering as they feed.

Classification

CLASS:Aves
ORDER:Psittaciformes
FAMILY:Psittacidae
GENUS:Trichoglossus
SPECIES:

Habitat & Range

These lorikeets live in portions of coastal Australia and on nearby islands. They are one of 12 genera of lories and lorikeets. The genus Trichoglossus includes eleven species and numerous subspecies. The rainbow lorikeet is widespread throughout northern and eastern Australia; the scarlet-breasted lorikeet is found on the Lesser Sunda Islands; the coconut lorikeet is native to New Guinea and north Queensland, Australia.

All species live in a variety of lowlands including secondary coastal forests, primary forests, coconut groves, plantations, savanna and mangroves.

Location

Adaptations

  • Lorikeets’ beaks allow them to crush flowers making pollen and nectar easier to access.
  • The tips of their tongues have tiny hair-like structures called papillae that help them harvest pollen and nectar; when the tongue is extended, the papillae are erect, looking like tiny brushes.
  • Lorikeets have zygodactyl feet, two toes facing forward and two facing backward, making climbing and gripping easy; they are able to hang upside down to reach nectar.
  • Lorikeets are entirely arboreal which helps keep them safe from potential predators.
  • Their small size and bright colors act as camouflage in flowering trees.
  • Their diet makes them good pollinators.

Physical Description

  • Lorikeets range in size from ten to twelve inches (25-30cm) long and weigh 3.5 to 5.5 ounces (100-157g).
  • They have long tapered tails.
  • They are generally slightly smaller and have longer tails than lories, parrots that are members of the same subfamily, loriinae.
  • Their plumage is very colorful featuring green backs and blue or brown heads. Their breasts and abdomens are multi-colored combinations of red, gold, yellow, green and blue that vary by species. Their common names describe the breast plumage of several species.
  • Their sharply curved beaks are orange to red.
  • Males are slightly larger than females with slightly longer beaks.

Diet

What Does It Eat?

In the wild:
Lorikeets have a specialized diet of mostly nectar and pollen. They also eat fruits, seeds and insects.

At the zoo:
The lorikeets at the Denver Zoo feed on nectar throughout the day and receive both whole and chopped fruits at the end of each day. Their fruit diet is comprised of apples, pears and bananas, along with an additional fruit or veggie for variety. Their nectar comes as a specialized powder containing vitamins, proteins, and fibers similar to what they would be eating in the wild and is mixed with water to allow for easy drinking.

What Eats It?
Predators include birds of prey and snakes. Humans hunt lorikeets for their plumage and to sell as pets. In agricultural regions they sometimes are killed because they forage in crops.

Lorikeet on a branch at Denver Zoo Lorikeet Adventure

Social Organization

These lorikeet species tend to form monogamous pairs, mating for life. Pairs groom one another while resting. They live in noisy flocks that can include several species and range in size from several pairs to hundreds depending on the abundance of food. They are very active and vocal, screeching as they fly through the canopy and chattering as they feed.

Life Cycle

Mating season for these lorikeet species varies by locale. Courtship behavior includes wing-fluttering and swaying. They nest high in trees in hollows lined with decayed wood that both male and female prepare. The female lays two to three oval eggs about one inch long (2.7cm) and is solely responsible for incubating the eggs for 24-26 days although her mate may roost in the nest. The chicks hatch featherless and with closed eyes. Both parents participate in caring for the chicks. They fledge in about eight weeks. The young reach sexual maturity between 18 and 24 months. They can live twenty years or more in their native range.

Humboldt Penguin

Spheniscus humboldti

Penguins are flightless birds that are built to “fly” through the water. They have streamlined, torpedo-shaped bodies and wings that have been reduced to strong, stiff flippers that help them propel rapidly through the water. They have webbed feet and legs that are set far back on the body, and their legs and tail are used like rudders for steering as they swim. Diving down to catch fish, Humboldt penguins can stay under water for up to 18 minutes and they can swim 11-15 mph.

Classification

CLASS:Aves
ORDER:Sphenisciformes
FAMILY:Spheniscidae
GENUS:Spheniscus
SPECIES:humboldti

Habitat & Range

Open ocean and the rocky shores near cliffs or on islands off the coasts of Chile and Peru.

Humboldt penguins inhabit coastal areas of Chile and Peru.

Location

north america globe

Adaptations

  • Can You See Me Now?
  • Despite differences in size, all penguin species have similar coloration, with black feathers on the back and white feathers on the front. This counter-shading is a form of camouflage that is crucial in avoiding predation and catching prey. From above, the dark coloration helps them blend into the blackness of the ocean water, but from below the lighter color helps them blend into the bright surface of the ocean.
  • A Fine Feather Coat
  • Although Humboldt penguins live in a relatively warm region off the coast of South America, the ocean waters further offshore are cold. The penguins have three layers of short feathers that overlap like shingles on a roof, making them waterproof. They also have a well-defined layer of fat to helps keep them warm. However on shore they can get very hot. They have an extensive area of bare pink skin at the base of their bills that helps them to radiate heat and cool off.
  • Flying Through Water
  • Penguins are flightless birds that are built to “fly” through the water. They have streamlined, torpedo-shaped bodies and wings that have been reduced to strong, stiff flippers that help them propel rapidly through the water. They have webbed feet and legs that are set far back on the body, and their legs and tail are used like rudders for steering as they swim. Diving down to catch fish, Humboldt penguins can stay under water for up to 18 minutes and they can swim 11-15 mph.

Physical Description

  • Humboldt penguins are 25-28 inches (65-72 cm) tall.
  • They weigh seven to 13 pounds (3.6-5.8 kg).
  • They have black feathers on the back and white feathers on the front with a distinctive U-shaped black band across the front.
  • They have a slightly larger bill than other penguins.
  • They have splotchy pink patches on their webbed feet and at the base of their bill.

Diet

What Does It Eat?

In the wild:
Smaller fish including anchovies, krill and sardines.

At the zoo:
Fish.

What Eats It?
Leopard seals, fur seals, sea lions, sharks and killer whales prey on adults; eggs and chicks are subject to predation by birds, snakes and foxes.

Social Organization

Humboldt penguins are highly social birds that live in small colonies called rookeries.

Life Cycle

Like all penguins, Humboldt penguins are monogamous and mate for life. Breeding occurs after a brief courtship. Both the male and female dig a burrow in rookery dried guano (bird poop!) and when it’s ready the female lays two eggs. The parents take turns incubating the eggs until they hatch after about 40 days. The chicks are born with grayish brown downy feathers. Both parents feed their young by regurgitating food. The chicks go through their first molt at 70-90 days replacing their downy feathers with grey adult feathers that lack the distinctive black band on the front. With their adult feathers in place they can maintain body temperature and by 12 weeks they fledge and leave the breeding sight to forage for food on their own. Humboldt penguins reach maturity at about two years of age, and will return to their birth-rookery when they are ready to mate. Humboldt penguins can live up to 30 years in captivity.

East African Crowned Crane

Balearica regulorum gibbericeps

All cranes participate in spectacular dance routines involving head-bobbing, wing-fluttering, leaps and deep bows, running with wings flapping and even short, low flights. These elaborate dances serve as courtship rituals to attract mates. For young birds, dancing helps develop physical and social skills, but spontaneous dancing can occur anytime during the year. In a flock of cranes, if one bird starts dancing soon all the others join in. In many cultures, including Native Americans, Australian aboriginal peoples, African tribes and the Ainu of Japan, humans mimic crane dances.

Classification

CLASS:Aves
ORDER:Griformes
FAMILY:Gruidae
GENUS:Balearica
SPECIES:Regulorum

Habitat & Range

This species of bird prefers wetlands with nearby grasslands and cultivated land near rivers and lakes.

East Africa from northern Uganda and Kenya south to Zimbabwe, Botswana and Namibia.

Location

Adaptations

  • Stamp Your Feet
  • Crowned cranes stomp their feet as they walk across grasslands. This flushes out insects and other potential prey that the cranes quickly catch and eat. Cranes are also often seen moving among herds of large mammals to feed on the insects frightened by herd movement.
  • Crane Chorus
  • Living in large flocks, cranes have developed several methods of communication. All cranes are noted for their loud calls that can be heard over three miles (five km) away. Crane chicks start learning the meaning of various calls soon after they hatch. The unique “unison call” of a mated pair of crowned cranes announces their presence in occupied territory and warns other birds away. This call is a duet that begins when the male emits a series of long, low calls. The female answers with several short, high-pitched calls. Other nearby crane pairs return the calls to establish their territory resulting in a chorus of crane calls echoing across the area. Other forms of crane communication include body postures and displays that can signal aggression, threats or submission toward other birds.
  • Dance, Dance, Dance
  • All cranes participate in spectacular dance routines involving head-bobbing, wing-fluttering, leaps and deep bows, running with wings flapping and even short, low flights. These elaborate dances serve as courtship rituals to attract mates. For young birds, dancing helps develop physical and social skills, but spontaneous dancing can occur anytime during the year. In a flock of cranes, if one bird starts dancing soon all the others join in. In many cultures, including Native Americans, Australian aboriginal peoples, African tribes and the Ainu of Japan, humans mimic crane dances.

Physical Description

  • Crowned cranes stand 44-48 inches (112-122 cm) tall; males are slightly taller on average.
  • They weigh six to eight pounds (3-4 kg).
  • They have a wingspan of six and a half feet (2 m).
  • They have slate grey feathers on their body. Wings are white with black and chestnut coloring.
  • These birds are named for the distinctive, bristle-like, golden feathers on top of their black head.
  • They have a bright red patch above white cheeks and a red neck wattle.
  • Their long legs and beak are black.

Diet

What Does It Eat?

In the wild:
Seeds, plants, grain, insects, worms, frogs, lizards, small fish and eggs. They forage on agricultural land.

At the zoo:
Nutritional crane pellets and assorted greens.

What Eats It?
African predators including hyenas, lions, leopards and cheetahs.

Social Organization

Crowned cranes are social and gregarious birds living in flocks of up to 200 birds during most of the year. During breeding season, mated pairs establish and defend a nesting territory using their loud calls to warn other birds away.

Life Cycle

Like other cranes, East African crowned cranes are monogamous and pair for life. During breeding season, both males and females participate in graceful and elaborate mating dances. Once paired, mated couples build a large circular nest, made of grasses and vegetation, in a secluded area of marshy ground. The female lays up to four bluish-white eggs, and both parents incubate the eggs; females incubate at night and males during the day. The eggs hatch after 28-31 days. Crane chicks are well developed when they hatch and within a few hours can follow the parent birds around learning how to forage for food. The chicks develop flight feathers at two to four months but after fledging stay with their parents for eight to ten months, until the next breeding season. After leaving their parents, young birds gather with other juveniles and move to new foraging and roosting sites. By 18 months the young have developed adult plumage and begin practicing threat displays and mating dances. East African crowned cranes are fully mature by two to three years of age; these birds can live 20-40 years.years in captivity.

Sarus Crane

Grus antigone

Cranes make loud trumpeting calls that carry for several miles. Their windpipe is lengthened by coiling within the breastbone, which amplifies their sounds. The most well-known crane call is the unison call made by paired adults to establish and announce their territory. Adult cranes can also make a range of sounds from hissing to purrs to screams. Chicks and juvenile cranes make a low clear “peep” which is repeated at short intervals.

Classification

CLASS:Aves
ORDER:Gruiformes
FAMILY:Gruidae
GENUS:Grus
SPECIES:antigone

Habitat & Range

Wetland habitats including marshes, swamps and flooded fields.

The sarus crane is found in three distinct populations: northern Australia, southeastern Asia (Cambodia, Vietnam, Myanmar) and the Indian subcontinent (Pakistan, India, Nepal).

Location

Adaptations

  • So You Think You Can Dance
  • Before mating, paired cranes engage in intensive periods of elaborate dance moves that include head bobbing, leaping, deep bowing, running with wings flapping and short ritual flights accompanied by loud trumpeting calls. Juvenile birds engage in “social dancing” that helps develop pair bonds. Even downy chicks mimic the adult dance moves! Dancing is not just a mating behavior. Elegant displays of carefully orchestrated dances occur during the non-breeding season when one pair begins a display, which then spreads through the entire flock.
  • How White Your Eggs Are
  • Sarus cranes lay bright white eggs. This species breeds in tropical and subtropical areas where temperatures are sometimes so hot that exposure to sunlight is a threat to the survival of the embryo. As a result, these cranes must shade their eggs from the sun. The light color of the eggs might help deflect heat from sunlight. In contrast, cranes that breed in the coldest areas (lesser sandhill, Siberian, and black-necked) have the darkest eggs, perhaps an adaptation to absorb more heat from sunlight.
  • Crane Calls
  • Cranes make loud trumpeting calls that carry for several miles. Their windpipe is lengthened by coiling within the breastbone, which amplifies their sounds. The most well-known crane call is the unison call made by paired adults to establish and announce their territory. Adult cranes can also make a range of sounds from hissing to purrs to screams. Chicks and juvenile cranes make a low clear “peep” which is repeated at short intervals.

Physical Description

  • Sarus cranes stand up to six feet tall (1.8 m).
  • They weigh 11-26 pounds (5-12 kg) – males are larger than females.
  • They have a wingspan of 8.5 feet (2.6 m).
  • They have gray wings and body, a bare red head and upper neck with a narrow band of bristle black feathers, a white crown and black wingtips.
  • Juveniles have darker gray body feathers and buff colored feathers on the head.
  • They have a long, dark pointed bill.
  • They have long pale red legs.

Diet

What Does It Eat?

In the wild:
Frogs, lizards, grasshoppers, seeds, grains, cereal crops like rice, insects, aquatic plants, fish, water snakes and eggs of other birds.

At the zoo:
specialized crane pellets, meat diet and large mealworms

What Eats It?
Birds including crows and kites prey on eggs; dingos, foxes or feral dogs prey on chicks.

sarus crane chick and mother

Social Organization

Sarus cranes are usually seen in pairs or family groups. They may congregate in large flocks of up to 200 birds during non-breeding season. Non-breeding birds may stay in flocks until they find a mate and establish a breeding territory.

Life Cycle

Sarus cranes are monogamous mating for life. During the breeding season, mated pairs perform loud trumpeting calls and elaborate dance moves. Mated pairs establish a nesting territory and build a large nest in a wet marsh or paddy field. The nest can be more than six feet in diameter and three feet high. Nests may be reused year after year. The female lays a clutch of one or two eggs and both parents share incubation duties – females at night and males during the day. The eggs hatch after about 27-35 days. Newly hatched chicks are well developed when they hatch and they are immediately able to follow the adults around the shallows until they develop flight feathers at two to four months of age. After they fledge they remain with their parents until the next breeding season and then disperse. Because of predation of both eggs and young chicks, the breeding success rate for sarus cranes is estimated at only 20%. Sarus cranes may live up to 42 years in captivity.

African (Black-Footed) Penguin

Spheniscus demersus

Penguins are flightless birds that virtually fly through the water. They have a streamlined torpedo-shaped body and wings that have been reduced to strong, stiff flippers that help rapidly propel them through the water. They have webbed feet and legs that are set back on the body. The legs and tail are used like rudders for steering. Diving down to catch fish, African penguins can stay under water for as long as five minutes and can swim at an average rate of three to six mph (5-10 kph).

Classification

CLASS:Aves
ORDER:Sphenisciformes
FAMILY:Spheniscidae
GENUS:Spheniscus
SPECIES:demersus

Habitat & Range

African penguins, also called black-footed penguins, nest on sandy or rocky islands and mainland beaches with temperate climates, and they forage for food in cold ocean currents whose temperatures range from 42 to 68 degrees Fahrenheit (5-20° C).

This species lives only on coastal islands and the mainland of southwestern Africa from Namibia to South Africa.

Location

Adaptations

  • African penguins are excellent swimmers and divers, flying through the water rather than the air.
  • Their streamlined torpedo-shaped bodies allow them to swim at three to six miles per hour (5-10 km/h) and reach speeds higher than thirteen miles per hour (20 km/h).
  • Their wings are modified into stiff flippers and their legs and tail act as rudders providing agility in the water.
  • They can swim more than 40 miles (65 km) in search of food.
  • Unlike most birds, they have solid, heavy bones that enable diving.
  • African penguins have short, dense feathers with fluffy down at their bases that overlap like shingles to repel water and provide insulation.
  • Glands at the base of the penguins’ tails yield oil that waterproofs their feathers.
  • layer of fat provides additional protection against chilly ocean waters.
  • To stay comfortable on land during warm weather, penguins have exposed pink skin above their eyes that allow heat to escape when blood is sent to them.
  • Their black backs and white undersides, known as counter-shading, help camouflage them from predators in the water and in the air.

Physical Description

  • African penguins are small penguins standing between 24 and 27 inches tall (60-70 cm) and weighing between six and nine pounds (2.7-4 kg).  Males are slightly larger than females.
  • Their bodies are torpedo-shaped; their backs are black and their chests and bellies are white with a black inverted U-shaped stripe.
  • Small black spots on their chests are unique to each individual.
  • Their large black heads have C-shaped white feathers surrounding each side of their faces and sharp pointed beaks.
  • They stand upright on black webbed feet and walk awkwardly on land.

Diet

What Does It Eat?

In the wild:
African penguins eat sardines, anchovies, mackerel, squid and crustaceans.

At the zoo:
Their diet includes thawed herring and capelin plus a supplement that replaces nutrients lost during the freezing/thawing process.

What Eats It?
African penguins are preyed upon by seals, mongoose, leopards and sharks.  Gulls and ibis prey on chicks.

penguins

Social Organization

African penguins are very social animals.  They nest in colonies of 50-100 called rookeries and frequently vocalize to establish pair bonds, defend nesting sites and communicate between mates in the ocean and on land.

Life Cycle

African typically stay with a mate for an extended amount of time once a pair bond is formed  Young males court females by dancing and beak slapping.  The pair establishes a bond by sharing loud, harsh calls that sound like a donkey braying.  They nest in shallow depressions either on open ground or under a bush or rock.  Females usually lay two eggs which are incubated by both members of the pair for about 40 days.  Hatchlings are covered in gray or gray-brown down and are brooded constantly for about fifteen days until they can regulate their temperatures.  During the first thirty days, the parents take turns feeding the hatchling partially digested regurgitated food while the other parent forages.  When the chicks are a month old, they are left in nursery groups to stay warm and shelter from predators while both parents forage but continue to be fed until they fledge at 60 to 130 days.  Once they fledge, they leave the colony for one to two years sporting their new plumage of gray backs and white fronts.  Most return to their birth colony prior to molting into adult plumage.  Females are usually mature at three years old and males at four years.  Life span in their natural environment is fifteen-twenty years.  African penguin males in institutions accredited by the Association of Zoos and Aquariums have a median life expectancy of about 17 years; females about 15 years.

Denver Zoo
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