The evolution of feathers and the benefits they provided are summed into two theories. 1)________ theory which provides benefits to a running animal. 2)________ theory which provides benefits to a tree dwelling animal.
1) Cursorial
2) Arboreal
300
Perching birds have what foot arrangement?
Anisodactyl
300
What does the gizzard function in?
Digestion, grinds and crushes food
400
The opposable rear toe is very important for gripping a branch in perching birds. What is another name for it?
What is the hallux
400
Waterfowl: ducks, geese, swans, and screamers are all classified in the Order ________.
Anseriformes
400
How does the Avian hand differ from that of the reptilian hand.
Fused and reduced fingers and claws absent on digits.
400
In the avian respiratory system air goes from the bronchi directly to what?
The posterior air sacs.
400
This secrets an oil to help maintain the health of the bird's feathers.
Also birds do what to clean areas the beak can't reach
1)Preen gland
2)Scratching
500
How does the Occipital Condyle differ in birds/reptiles versus mammals.
Birds/Reptiles have one
Mammals have two
500
Cuckoos are in which Order?
Cuculiformes
500
what is another avian like reptile from the time of archaeopteryx
1)Confuciusornis
2)Jeholornis
3)Sinornis
500
This slot functions in smoothing airflow over the wing