Gravity.
when penguins started flying when penguins started flying
Penguins can't fly.
Chicken, ostrich, penguins.
Penguins don't have gills. Penguins have lungs, like all birds. They've simply opted for swimming instead of flying.
flying away from the sun.
Many are, engaging in social interaction with other penguins and with humans. Unlike flying wild birds, penguins are closer in temperament to pet birds.
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Penguins use them for steering through the water.
well penguin hands are not 4 flying their for swimming
gravity.
Seriously? Gravity.
Yes, but only one specific species. Most penguins bones have evolved to be more solid, allowing them to dive into water better. However, it prevents them from flying.