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