"To play the role of a bird" in Engpsh is "to play the role of a bird". The phrase is straightforward and simply describes the act of pretending to be a bird. The phrase is simple and direct, and it comes from the verb "to play" which means to pretend or act out a role and the noun "role" which means a character or part played by an actor.

Examples:

He loves to play the role of a bird in the school play.
他喜欢在学校剧中扮演一只鸟。

She is going to play the role of a bird in the upcoming movie.
她将在即将拍摄的电影中扮演一只鸟。