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19 Cards in this Set

  • Front
  • Back
down feather
a fluffy insolating feather that lies nexts to a birds body
contour feather
a feather made of a stiff center, central shaft with many side branches called barb
preening
the activity that a bird uses to spread oil on the feathers
lift
an upward force on an object that can be explained by differences in pressure above and below the object; lift opposes the downward pull of gravity
brooding
when a bird sits on its egg until they hatch
mammary glands
glands that secrete a nutritous a fluid called milk
diaphragm
the sheet of muscle underneath the lungs of mammals that helps draw air into the lungs
monotreme
a mammal that lays eggs
marsupial
a mammal that gives birth to live, partially developed young that countinue to develop in the mothers pouch or skin fold
placental mammal
a mammal that nurses its unborn offspring with a placenta inside the uterus and gives birth to well developed young
gestation period
the time during which an embryo develops within the mother
gizzard
contains small stones that grind up the food
precoal
chicks that hatch fully active
altrical chick
a chick that hatches weak, naked, helpless
crop
a organ that holds incoming food
intestine
digests the food
placenta
a mammal that nourishes its unborn offspring with a placenta inside the uterus and gives birth to well developed young
uterus
the organ in the female reproductive system where the zygote grows and develops
pinnipedes
fish eating marine mammals