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Some birds, including the largest of all living
birds, have lost the ability to fly. The ostriches and
their relatives-rheas, emus, cassowaries, and kiwis-are
flightless birds found in Africa, South America, and
Australia, including New Guinea and New Zealand. The
tinamous of Central and South America are related to
the ostrich group, but they have a limited ability to
fly. Other birds that feed primarily on the ground and
are excellent runners include the bustards (relatives
of the cranes) and megapodes, members of a group of
chickenlike birds that includes quail, turkeys, pheasants,
and grouse. Vegetation is an important part of the diets
of running birds.
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