Radience

Birds and Mammals

Science

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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