Crossword Genius

Early bird food? (4)

Ross

I believe the answer is:

worm

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'early bird' is the first definition.
The definition and answer can be both animals as well as being singular nouns.
Maybe you can see an association between them that I can't see?

'food?' is the second definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

Can you help me to learn more?

(Other definitions for worm that I've seen before include "mean creature" , "Wriggly creature" , "Reproductive computer virus" , "Legless creature - grovelling type" , "Animal with no bones or limbs - it may turn" .)

I've seen this clue in The Sun.
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