click below
click below
Normal Size Small Size show me how
Vertebrates - 2
Birds and Mammals
Question | Answer |
---|---|
preening | in birds, the act of grooming and maintaining their feathers |
molting | the shedding of an exoskeleton, skin, feathers, or hair to be replaced by new parts |
down feathers | a soft feather that covers the body of young birds and provides insulation to adult birds |
contour feathers | one of the most external feathers that cover a bird and that helps determine its shape |
lift | an upward force on an object that moves in a fluid |
brooding | to sit on and cover eggs to keep them warm until they hatch to incubate |
mammary gland | in a female mammal, a gland that secretes milk |
diaphragm | a dome-shaped muscle that is attached to the lower ribs and functions as the main muscle in respiration |
placental mammal | a mammal that nourishes its unborn offspring through placenta inside its uterus |
gestation period | in mammals, the length of time between fertilization and birth |
monotreme | a mammal that lays eggs |
marsupial | a mammal that carries and nourishes its young in a pouch |