Which of the following characteristics is shared by Neophron, Aptenodytes, and Psittacula?

Step-by-step solution

Neophron (vulture), Aptenodytes (penguin), and Psittacula (parrot) all belong to Class Aves (birds). A characteristic feature of birds is that their digestive tract has additional chambers, the crop and gizzard. Birds have skin that is dry without glands except for the oil gland at the base of the tail, but they possess feathers, not hair. They are homoiothermous (warm-blooded) animals with a completely four-chambered heart. They exhibit direct development without any larval stage and respire exclusively through lu