鳥は空を飛びます。

bird; bird meat (esp. chicken meat); fowl; poultry

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

sky; the heavens

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to fly; to soar; to jump; to leap; to spring; to bound; to hop