1. Wings: Bats have wings made of skin supported by long, thin bones. Birds have wings made of feathers supported by bones that are more like those found in human arms and legs.
2. Pelage: Bats have fur, while birds have feathers.
3. Flight: Bats fly by flapping their wings, while birds flap their wings and soar.
4. Diet: Bats are mostly insectivorous, while birds have a wide range of diets that include insects, fruits, seeds, and small animals.
5. Hibernation: Bats hibernate during cold weather, while birds migrate to warmer climates or adapt to the cold.
6. Echolocation: Bats use echolocation to navigate and find prey, while birds do not.
7. Nesting: Bats roost in caves, trees, or buildings, while birds build nests in trees, on cliffs, or in buildings.
8. Reproduction: Bats give birth to live young and nurse them with milk, while birds lay eggs and incubate them until they hatch.
These are just a few ways to tell a bat from a bird. There are many more differences between these two groups of animals.