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They can slide.

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6-9 kilometres per hour when walking. 35 kilometres per hour when swimming.

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push against water

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A penguin can be from 2-90 LBS

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about 200 pound

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They are missing a bone in there breast part no keel

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A penguin is much heavier and has many adaptations to stay warm in the VERY cold water. Flying birds do not have to worry about this. Penguins are much slower than other birds.

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How Penguins Have Adapted to Their Environment. N.p., n.d. Web. 21 Apr. 2017.
" ABOUT OSTRICHES AND OSTRICH FEATHERS." LAMPLIGHT FEATHER, INC. N.p., n.d. Web. 21 Apr. 2017.
N.p., n.d. Web
Air and Aerodynamics: Grade 6, Topic A. Edmonton, AB: Edmonton Public Schools, 1996. Print.
" ABOUT OSTRICHES AND OSTRICH FEATHERS." LAMPLIGHT FEATHER, INC. N.p., n.d. Web. 25 Apr. 2017.

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The feathers are tightly packed with a special oil to keep the cold water out to preserve body heat. They trap air.

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Hallow bones,smaller, ostriches use their feet while the birds use their wings to travel.

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A penguin's wing movement is just like a bird fly bird's which gives the impression that they fly underwater. They have very strong chests to swim fast (Wait a few seconds for the video to load.)

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A special adaptation is its webbed feet to get more thrust. They have blubber to keep warm. Penguins also huddle together, have a special oil to keep water out along with densely packed feathers. These are important to travel because if a significant amount of water breached the fat, the feathers, and the oil. Then they may freeze when travelling. They can slide on their tummy

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A penguin's tail is wedge shaped.
Fun Fact: An adult penguin's back is always dark while the front is lighter.

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Special adaptation that help them travel 

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Special adaptation that help them travel 

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ostriches legs are super strong which allows them to run very quickly. They run 70 km per hour.
They don't migrate.
4 hours to boil ostrich eggs

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The tail of the ostrich is triangle shape. Does nothing

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The wing is modified to look like a flipper. the wrist and elbow are almost fused together.
They move their wings like birds

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The wing movement does not help them fly but they balance the ostrich while it is running. The wing just flaps.

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The body is rather big which makes it hard to fly. Its body is not streamlined which makes it hard to fly.

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Penguins have solid bones. This makes them heavier. This is a reason why they cannot fly. This also helps them stay underwater. When swimming. A Penguin's bone is fused and very rigid. This gives them the strength.

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Some ostriches bones are rather heavy and solid bones .

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Some ostriches bones are rather heavy and solid bones .

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A penguin's body shape is streamlined like a bird. This helps them travel in the water, not in the air.
Like a bullet

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The feathers don't open and close like a bird's.
feather easily be broken

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The wings were not like a bird it was much smaller than birds.