The Bible says that bats are birds but we all know they are mammals...?

... why should I believe anything the Bible says?
Update: here ya go...

Lev. 11:13, 19 And these are they which ye shall have in abomination among the fowls...And the stork, the heron after her kind, and the lapwing, and the bat. (See also Deut. 14:11, 18)
Update 2: So the penguin is not a bird? ok, thanx!
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