How Ostriches Evolved to Lay Eggs in a Joint Nest.

Ostriches can lay the largest eggs of any living animal. When it comes time for breeding, unrelated females will lay their eggs together in a single nest. The male will then raise the joint clutch, along with the dominant female. This behaviour is known as communal nesting. For a bird, it’s an unusual mating system, unique to only a handful of species, including the greater rhea. How did this behaviour evolved?

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