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There isn't a mammal-bird.
No. Whether it is tropical or not, no bird is a mammal.
The developing baby inside a mammal is nourished internally by the mother until the baby is ready to be born. In an egg, the only nourishment available to the developing young is the yolk sac.
No. A budgerigar (budgie) or parakeet is a bird, not a mammal.
There is no such thing. No bird is or ever was a mammal.
A mammal.
mammal
Mammal embryos don't require a large yolk becaues they are nourished directly by the mothers body. In contrast, birds, reptiles, and other (mostly) egg layers, need a large yolk because the yolk must nourish the embryo all the way through development.
Bird
The Kea is not a mammal. Its a bird.
A stork is not a mammal. It is a bird.
A chickadee is not a mammal. It is a bird.