You probably think that all birds can fly, but that is not the case.
One group of flightless birds, called ratites, includes ostriches, rheas, emus, cassowaries, and kiwis. Ratites are different from other flightless birds. Their name means “raft” in Latin (ratis) because their breastbone is shaped like a flat raft.
Ratites, unlike most birds, don’t need to fly to survive, most of them are big and all of them are fast. Ratites also have a special feather called a “plume feather”. These feathers are unlike bird of flight feathers because they lack the microscopic barbs that hold the feather together. Plume feathers appear to be hair like and breezy, which is good when needing to move through the wind in order to run fast.

Since ancient times, people have decorated themselves with ratite plumes, and made water bottles and dishes out of ratite eggshells. The ancient Egyptians trained ostriches to pull carts. But the ostriches tired out quickly, squatted down, and quit.
Left, Ostrich Dance.

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