The San Antonio Zoo’s annual ZOO BOO! celebration will return in September.

Guests of all ages can visit the 39th annual celebration from Sept. 20 through Oct. 31, according to a news release. Festivities include trick-or-treating, live entertainment and interactive animal encounters.

Daily trick-or-treating will take place from 4 p.m. to 5 p.m. starting Sept. 20 through Oct. 30.

All candy handed out during trick-or-treating is eco-friendly and contains sustainably sourced palm oil, the release said.

“This is part of a larger initiative to support rainforest ecosystems and the animals that rely on them,” the release said.

ZOO BOO! Dog Day! dog costume contest and dog-friendly trick-or-treating will take place on Sunday, Oct. 9.

Other ZOO BOO! events and activities include: • Reimag

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