Birds and Mammals

Science

Birds and Mammals Chapter Video

Birds and Mammals Chapter Video

contour feather

the outermost layer of feathers that give a bird its shape

contour feather Simple Definition

diaphragm

the muscle below the lungs that controls breathing

diaphragm Simple Definition

down feather

a soft, fluffy feather that traps heat to keep birds warm

down feather Simple Definition

gestation period

the time between fertilization and birth, when young develop in the uterus

gestation period Simple Definition

mammal

a warm-blooded vertebrate whose young feed on milk produced by the mother

mammal Simple Definition

mammary gland

milk-producing gland in female mammals

mammary gland Simple Definition

marsupial

a mammal that carries its young in a pouch

marsupial Simple Definition

monotreme

a mammal that reproduces by laying eggs

monotreme Simple Definition

placenta

an organ that connects a fetus to its mother, providing it with nutrients and removing waste

placenta Simple Definition

placental mammal

a mammal that nourishes its unborn offspring through a placenta in the uterus

placental mammal Simple Definition

preening

the grooming and maintenance of their feathers by birds

preening Simple Definition

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