The director of the zoo where a 4-year-old boy fell into a moat that housed a silverback gorilla Saturday said he stands by the decision to kill the 400-pound animal.

“We stand by our decision, and we’d make the same call today,” Thane Maynard, director of the Cincinnati Zoo and Botanical Garden, said at a press conference Monday. He added that people who second-guess the decision “engage in Monday-morning quarterbacking and do not understand primate biology.”

His remarks came as animal rights groups were expressing outrage over the killing of the 17-year-old gorilla.

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