0 to stare with open mouth, eg in surprise -- civět (s otevřenými ústy)
The children gaped at the monkeys.
The oven pipe gapes open and will not shut.
Once squab start thrusting at grain, gapes occur.
One possibility is that loss of the fleshy cheek facilitated a wider gape.
Additionally, the body positioning, thrust, and gape components must all be coordinated properly for a peck to result in the successful ingestion of food.
Why haven't host nervous systems evolved resistance to the red gape drug?
The effect of genes on colour and shape of gape is itself indirect.
Another possibility is that a wider gape permitted bulk ingestion of greater quantities of vegetation per mouthful and/or ingestion of larger individual food items.
Whatever it is about the cuckoo's gape that acts like a drug on the host's nervous system, it must have originated as a genetic mutation.
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