Thursday in the Park With Bigfoot

If you were near the Ramble in Central Park on Thursday afternoon, you might have thought you were in a “Planet of the Apes”-themed episode of “What Would You Do?”

Because you may have witnessed a 6-foot-7 longhaired sasquatch slowly traversing tall rocks and promenading through thickets, grunting at the sky and scaring children and dogs silly.

But what you saw wasn’t Bigfoot. It was a big gimmick.

The sasquatch sighting was a gorilla — sorry, guerrilla — publicity effort for “Sasquatch Sunset,” a new film directed by the brothers David and Nathan Zellner that opens in New York on April 12.

Conceptually, the promotional shenanigans in Central Park were in line with the film’s irreverent sensibility. A mix of bro comedy, National Geographic documentary and emotional family drama, it stars Riley Keough and Jesse Eisenberg as members of a pack of kind-eyed sasquatches who brave life and death in the wilderness.

Nathan Zellner, who plays the male alpha, was the human underneath the hairy suit on Thursday. A natural grunter, he was greeted by big laughs and phones aloft the moment he stepped out of a van across from the American Museum of Natural History.

Inside the park, Trey Hope stopped to gawk and take a snapshot. What was it and why was it there? He wasn’t sure.