Meaning: Animals with feathers and wings moved through the air to places where they build things to lay eggs.
Choice of Words: Birds: noun, animals with feathers and wings; flew: verb, past tense of fly, to move through the air using wings; to: preposition, indicating the direction or destination of movement; their: adjective, belonging to or associated with a particular person or thing; nests: noun, structures built by birds to lay eggs and raise young.