These organisms have unidirectional respiration because they store air in nine large sacs before the lungs.
An organism from this class was the source of the first oncogene, Src. Lekking is most common in members of this class. The traditional route of vaccine manufacture kills an embryo of an animal in this class. These organisms have unidirectional respiration because they store air in nine large sacs before the lungs. Konrad Lorenz discovered (*) imprinting in this class of animals. They have specialized syrinxes for vocalization and a muscular, gritty gizzard. The H5N1 flu virus has killed thousands of animals in this class, though luckily it hasn't yet spread to humans. For 10 points, name this class of vertebrates with feathers and wings.
An organism from this class was the source of the first oncogene, Src.
Aves [or birds; or avians; prompt on chickens or geese]