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Parrot cheeks

I've been looking at several parrot skulls and faces.
They seem to have some kind of 'cheek' surrounding the
mouth just behind the beak. In other birds, this part
is cheekless but possesses lips or some sort of horny
covering. Could this cheek-like structure be similar
to those interpreted for ornithischians? Is it muscle
or ligament or skin?...any ideas?
Meor Hakif
Geology Dept.
Univ. Malaya

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