Zoology 10th Edition by Stephen Miller,John Harley

Exercise 8

Some of the endocrine glands found in birds but not mammals and their unique functions are as follows: the pituitary produces prolactin, which causes "pigeon's milk" to be produced; the thyroid produces thyroxine, which causes development of feathers and molting; testosterone from the testes in male birds causes their bright plumage; and the bursa of Fabricius plays an important role in the maturation of B cells and the immune system. A host of other endocrine glands, including the pituitary gland, thyroid gland, adrenal glands, Islets of Langerhans, and others provide chemical regulation in both birds and mammals.
What hormones discussed in this section are regulated by the nervous system and what hormones are free of nervous control?