ダチョウはカンガルーと同様空を飛べない。

ostrich (Struthio camelus)

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

kangaroo

if; when; and; with; particle used for quoting (with speech, thoughts, etc.); quoting particle; promoted pawn; indicates question (sentence end)

identical; equal to; same (kind); like; similarity

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.