Scientists use many different types of tools when doing research.

For example, when making observations, they may use a microscope to see small things up close, a scale to measure weight, or a thermometer to determine changes in temperature.

At Denver Zoo, animal care staff sometimes use a tool called an ethogram to help them study animal behavior. Understanding animal behavior is important, so keepers and veterinarians know when an animal is happy and healthy, and recognize signs when it may not be feeling well.