A feature named 'knee' doesn't appear in a parrot's skeleton as an identified component of its leg. But you could consider that the joint between the bird's femur and tibiotarsus to be a knee or the location of its knee.
No, humming birds do not play dead.
No. Birds see color. This is a necessary adaptation for humming birds, which get their nutrition from flowers.
they are birds
No because humming birds hum, and mocking birds mock.
No.
No they are not.
Humming Birds
No, birds lay eggs and their chicks hats from these eggs. Humming Birds are birds (it says so in their name) so they hatch from eggs.
humming birds
Eggs
I think they are.
Yes