Question

Why Some birds cant fly?​

Answer 1

Ostriches, emus, cassowaries, rheas, and kiwis can't fly. Unlike most birds, their flat breastbones lack the keel that anchors the strong pectoral muscles required for flight. Their puny wings can't possibly lift their heavy bodies off the ground.

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Answer 2

Answer:

Explanation:

Some birds simply didn't evolve to fly. Penguins have become too fat and bulky, good for the freezing cold of the Antarctic, but too heavy to make it off the ground. Ostriches have adapted to run at great speeds, but are also too heavy to take flight. Like humans, some birds aren't built to fly.