Crazy birds? (4)
I believe the answer is:
bats
This clue might be a double definition.
'crazy' is the first definition.
(I've seen this before)
'birds?' is the second definition.
The answer and definition can be both animals as well as being plural nouns.
Perhaps you can see an association between them that I don't see?
Can you help me to learn more?
(Other definitions for bats that I've seen before include "Mad - clubs" , "Take a stab at the night creatures" , "Crazy - mammals" , "out to lunch" , "Crazy; night-fliers" .)