Birds leave nests when they fly.
Meaning: Birds depart from the structures they built for laying eggs and raising young ones at the time they move through the air using wings.
Choice of Words: Birds are warm-blooded vertebrates that lay eggs. Leave means to go away from a place. Nests are structures built by birds for laying eggs and raising young ones. When shows the time or condition of the action. They refers to the birds. Fly means to move through the air using wings.
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