Birds

Birds are the only animals that have feathers. They are warm-blooded and lay eggs with hard shells. Most birds can fly, but some, like penguins and ostriches, cannot. There are about 10,000 species of birds in the world.

Built for Flight

Most birds have lightweight, hollow bones that make flying easier. Their feathers provide lift and keep them warm. Strong chest muscles power their wings. Birds that cannot fly often have other special skills, like fast running or swimming.

Bird Beaks and Feet

A bird's beak tells you a lot about what it eats. Eagles have sharp, hooked beaks for tearing meat. Hummingbirds have long, thin beaks for sipping nectar. Ducks have flat beaks for scooping up food from water. Bird feet are also shaped for their lifestyle.

Fun Facts

• The ostrich is the largest bird, standing up to 9 feet tall.
• The bee hummingbird is the smallest bird, weighing less than a dime.
• Penguins are excellent swimmers and can hold their breath for over 20 minutes.

Did You Know?

Birds are the closest living relatives of dinosaurs! Scientists have found fossils that show some dinosaurs had feathers, just like modern birds.