WATCH: Crazy hat lady jumps into Toronto Zoo tiger enclosure to retrieve her cap, alarming video shows

The Toronto Zoo said on Monday it is investigating a video that shows a woman climbing into part of its tiger enclosure to retrieve a hat.

The woman’s actions caused the animal to repeatedly lunge at her, but the seven-year-old Sumatran tiger remained behind a secondary fence and the woman climbed back out of the enclosure unharmed, according to the video, which was widely circulated on YouTube.

Mad hatter: woman climbs into tiger pit

A spokeswoman for the zoo, a sprawling forested park that features thousands of animals, said the zoo was unaware of the incident until the video surfaced over the weekend and is investigating.

“My understanding is it happened Saturday afternoon,” said zoo spokeswoman Jennifer Tracey.

Tracey said it is not unusual for items to fall into animal enclosures, but she urged people to contact zoo staff because they have equipment to safely retrieve lost items.

“No need to go after them yourself. Follow the signs, there is a reason they are there,” Tracey said.