Birds sleep in nests.
Meaning: This sentence describes birds resting in their nests. It's like saying, The warm-blooded vertebrates that can fly are resting in the structures built by birds to lay eggs and raise their young.
Choice of Words: Birds are warm-blooded vertebrates that can fly. Sleep is a state of rest for the body and mind. In is a preposition that indicates a position or location within something. Nests are structures built by birds to lay eggs and raise their young.
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Related Expressions