CBS has decided to cancel the summer dramatic series, Zoo, after three seasons and 39 episodes, The Hollywood Reporter writes.

The show, which was based on a James Patterson novel, starred James Wolk (Mad Men) as Jackson Oz, a zoologist who investigates mysterious animal attacks across the globe that ultimately shrink the human population.

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Zoo fared relatively well with the critics, scoring a 74 out of a possible 100 at, which tracks critical reviews.

“Wolk plays Jackson with such an easy air that the audience roots for him despite the thin characterization,” wrote The Wrap during season one.

However, like the human population in the show, Zoo’s ratings gradually began to shrink from season one to three. TV By the Numbers writes that Zoo lost nearly two million viewers in season three, compared to season two.

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Zoo’s now series finale aired on September 21, 2017.

Also cancelled yesterday: ESPN 2’s Barstool Van Talk, a late night talk show that aired just once. The show, which featured bawdy chatter about the sporting world, generated dismal ratings in its debut.

Several news reports also indicated that some ESPN staffers were embarrassed by the show’s tone which seemed targeted to appeal to testosterone-driven young males up late at night.

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— Phillip Swann