The Activity by Which Birds Maintain a Clean Plumage and Rid

Q16: The brain of a bird has a

Q17: In many birds,a diverticulum of the esophagus,the

Q18: Birds regulate their body temperatures at

Q19: The eyes of some birds have two

Q20: The structure that produces "pigeon's milk" is

Q22: The _,or "wishbone," of a bird is

Q23: Which of the following features of birds

Q24: A type of flight commonly used by

Q25: Anting,a common habit of many songbirds,involves picking

Q26: Posteriorly directed _ on the ribs of