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Do you like bats(蝙蝠)? I don’t. But they are interesting.

Birds can fly and bats can _______ too. Is the bat a kind of bird? The answer is “No”. Bats are mammals(哺乳动物). Birds and bats are _______.

Bats have four legs. _______ have only two. Bats have teeth and birds have no teeth. Bats have big _______, but birds’ ears are only holes in their heads.

All bats like to eat insects(昆虫). They look for food at night and _______ in the day. But most of the birds like looking for food during the day and have a rest _______. In the evening, bats are busy. They fly and _______ insects. A bat’s two legs _______ it fly and a piece of skin joins( 连接) them together. They are just like a bird’s _______.

Some people think bats have good eyesight. It is not true. Bats have eyes but can’t see well. They can hear very well, They can feel where a thing is. That is ________ bats can fly in the evening.