Struthioniformes is an order full of flightless birds such as ostriches and emus. They are mostly large and unlike most birds Struthioniformes don't have a keeled breastbone. This bone attaches to the wing muscles to help with flying. Struthioniformes are primarily herbivores or omnivores. Because these birds can't fly, they nest on the ground. Also the eggs of Struthioniformes are mostly incubated by the male.
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