ANS 282 Lecture Notes - Lecture 17: Phalanx Bone, Air Sacs, Cellulose
Document Summary
Archaeopteryx believed to be a primitive bird. It was covered with feathers, and had teeth, long tail, 3 claw-like digits on each wing. Modern birds appeared about 70 million years ago. Modern birds are classified into 28 orders containing 170 families and approximately. Species like parakeets have only been bred in captivity for 100s not 1,000s of years. Many pet birds and falcons are still obtained from the wild. Illegal exotic animal trade is comparable to the drug trade. Compared to dogs and cats, most pet birds are not fully domesticated. Falconry has been around for 3,500 years, but many birds were/are wild caught or involved wild breeding. Budgies are known more properly as : lorikeets, mynah birds, canaries, parakeets, lovebirds. Feathers are made of : melanin, keratin, lignin, cellulose, bone. Birds replace worn feathers through a process called molting . For most species this happens 1-2 times a year.
