Zoo premiered on June 30, 2015 on CBS. On October 23, 2017, CBS announced that the series was canceled.
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The series premiered on June 30, 2015, on CBS. On October 2, 2015, Zoo was renewed by CBS for a second season, which premiered on June 28, 2016. On August 10, 2016, CBS renewed the series for a third season, which premiered on June 29, 2017. There will not be a season 4 as it was cancelled due to low ratings.
Until the 20 th century, there was little or no concern for the welfare of zoo animals. It was not until the late 1970s and early 1980s that the appearance of zoos began to change to reflect the public opinion; this transition took place as people were educated about the true conditions endured by zoo animals.
The oldest zoo in the world still in existence is the Tiergarten Schönbrunn in Vienna, Austria. It was constructed by Adrian van Stekhoven in 1752 at the order of Emperor Francis I, to serve as an imperial menagerie as part of Schönbrunn Palace.