- Based on fossil evidence, the first bats lived on Earth over 50 million years ago.
- Bat wings consist of a double layer of skin that is stretched over bones.
- Bats are warm-blooded creatures that are most active at night. They breathe air through lungs, and give birth to live young.
- The shape of a bat’s teeth gives clues about its diet. Insect-eating bats, for example, have sharp teeth that can break through the hard shell of an insect’s body.
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- Birds are warm-blooded vertebrates and breathe air through lungs. They are the only group of animals covered with feathers.
- Not all birds can fly -- just look at an ostrich or a penguin! And not all flying animals are birds.
- Birds hatch from eggs and, unlike most vertebrates, they don’t have teeth.
- Scientists have discovered that some dinosaurs survived the great extinction millions of years ago. Their modern day relatives are parrots, pigeons, and the 9,000 other kinds of birds living today.
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