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| Six characteristics of birds: |
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Definition
| endotherms, feathers, beaks, fly, 4 chambered heart, lay eggs |
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| trap air to keep bird from losing heat; found right next to bird's skin |
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| balances and steers bird in flight; gives shape to a bird's body |
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| enables bird to obtain more oxygen from each breath of air than other animals |
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| Advantage of 4 chambered heart? |
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Definition
| keeps oxygen rich blood separate from oxygen poor blood |
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| part of the birds digestive system where small stones help grind up food |
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| part of the bird's digestive system where food is stored in the body after swallowed |
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| Why do birds need a lot of energy? |
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| Birds specialized features for their environment are: |
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| Ostriches adaptations to escape predators: |
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| difference in pressure, above and below the wings, as a bird moves through the air, producing an upward lift, causing the bird to rise. |
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| 4 chambered heart, breath with lungs, endothermic, skin with fur or hair, most born alive, young mammals feed with milk from mother, mammary glands |
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| organs in mother's body that produce milk |
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| 3 ways that birds can fly |
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| flight that requires most energy |
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| koala, kangaroos; carry young in a pouch |
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| part of a mammal that helps to breath by contracting (muscle below ribs) |
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| an organ in pregnant female mammals that passes nutrients between mother and baby |
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| canines: stab food and tear it; molars and premolars: grind and shred food into tiny bits; incisors: bite off and cut parts of food |
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| monotremes, marsupials, placental mammals |
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| length of time between fertilization and birth |
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