| A | B |
|---|
| Birds of prey | eat mammals, fish and smaller birds |
| water birds | many have webbed feet, and a variety of beaks, wings, and legs |
| perching birds | insect eaters with wings that let them fly quickly to persue insects |
| flightless birds | ostrich, rhea, road runners |
| seed eaters | perching birds that eat seeds |
| Scientists think that | feathers evolved from scales |
| there are 9000 | species of birds |
| birds have good | vision |
| birds have | light bones |
| birds have strong | muscles |
| a crop | stores food and releases it as the bird needs energy |
| a gizzard | grinds up food for easy digestion |
| birds breath with | lungs and air sacs |
| Birds have a | four chambered heart |
| feathers | come in many shapes and sizes on a bird |
| migration | moving to a different place during a part of a year |
| incubate | use body heat to keep eggs warm until they hatch |
| nests | used to protect eggs and keep them warm |
| a bird egg consists of | a Shell, albumen, yolk, and an embryo |
| DDT is a poison that | causes bird eggs to form with thin shells which break easily and kill chicks |
