Tropical bird has a bill in its stomach (5)

I believe the answer is:

macaw

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'tropical bird' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

(Other definitions for macaw that I've seen before include "Brightly-coloured parrot" , "Colourful creature" , "Large colourful parrot" , "New World parrot" , "Tropical parrot" .)

I've seen this clue in The Globe and Mail.

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