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27 Cards in this Set
- Front
- Back
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Bird
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An endothermic vertebrate that has feathers and a four-chamber heart, and lays eggs.
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Contour feather
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A large feather that helps give shape to a bird's body.
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down feather
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Short fluffy feathers that trap heat and keep a bird warm.
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insulator
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A material that does not conduct heat well and which therefore helps prevent it from escaping.
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crop
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A bird's internal storage tank that allows it to store food inside its body after swallowing it.
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gizzard
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A thick-walled, muscular part of a bird's stomach that squeezes and grinds partially degested food.
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lift
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The difference in pressure between the upper and lower surfaces of a bird's wing that produces an upward force that causes the wing to rise.
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mammal
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An endothermic vertebrate with a four-chambered heart, skin covered with fur or hair, and which has young fed with mild from the mother's body
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premolars
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Teeth that, along with molars, grind and shred food into tiny bits.
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mammary gland
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The organs that produce the milk with which mammals feed their young.
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incisors
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Flat-edged teeth used to bite off and cut parts of food.
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molars
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Teeth that, along with premolars, grind and shred food into tiny bits.
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canines
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Sharply pointed teeth that stab food and tear into it.
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diaphragm
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A large muscle in a mammal's chest that functions in breathing.
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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 whose young are born alive at an early stage of development, and which usually continue to develop in a pouch on their mother's body.
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gestation period
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The length of time between fertilization and birth of a mammal.
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placental mammal
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A mammal that develops inside its mother's body until its body systems can function independently.
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placenta
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An organ in pregnant female placental mammals that passes materials between the mother and the developing embryo.
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marsupial
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A mammal whose young are born alive at an early stage of development, and which usually continue to develop in a pouch on their mother's body.
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gestation period
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The length of time between fertilization and birth of a mammal.
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placental mammal
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A mammal that develops inside its mother's body until its body systems can function independently.
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placenta
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An organ in pregnant female placental mammals that passes materials between the mother and the developing embryo.
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marsupial
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A mammal whose young are born alive at an early stage of development, and which usually continue to develop in a pouch on their mother's body.
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gestation period
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The length of time between fertilization and birth of a mammal.
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placental mammal
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A mammal that develops inside its mother's body until its body systems can function independently.
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placenta
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An organ in pregnant female placental mammals that passes materials between the mother and the developing embryo.
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