The announcement was made by CBS Entertainment President Glenn Geller during a speech in Beverly Hills in front of the Television Critics Association.
The third season will air in 2017, joining the already announced summer return of Big Brother.
This year, Zoo has been the summer's second most-watched original scripted broadcast. The global thriller follows a wave of violent animal attacks against humans across the planet.
Watch Zoo on Tuesdays at 9/8c on CBS and CBS All Access. A special two-hour Season 2 finale will air on Tuesday, Sept. 6 at 9/8c.
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