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Two of the Philadelphia Zoo’s resident hippos got in the Halloween spirit by enjoying a special pumpkin treat, footage posted on October 3 shows.

This video shows a zookeeper tossing pumpkins into the waiting mouths of a pair of hippos.

“Open,” the zookeeper is heard saying to one of the large animals, who readily obliges.

Hippos can range in weight from 2,200 to 9,900 pounds, according to the Philadelphia Zoo.

The zoo was advertising its seasonal ‘Boo at the Zoo’ event, inviting visitors to wear costumes and trick-or-treat across the zoo. Credit: Philadelphia Zoo via Storyful