A 3-foot-long ball python escaped from its cage inside a Wisconsin high school – and is believed to be hiding out inside a science lab ventilation system, school officials told The Post.

Kai, a male ball python, escaped from his cage in a Fond du Lac High School science lab over the Labor Day weekend.

What is a ball python snake? And why isn't this 'nice cousin' to the Burmese hunted in Florida? We explain the details.