cheetah, ostrich. 獵豹， 鴕鳥。

A dangerous game of tag! Bizarre pictures show a cheetah and an ostrich chasing each other across the African plains | Mail Online http://www.dailymail.co.uk/news/article-2149232/A-dangerous-game-tag-Bizarre-pictures-cheetah-ostrich-chasing-African-plains.html