The video showed the zookeeper tossing pumpkins into the waiting mouths of a pair of hippos. Hippos can range in weight from 2,200 pounds to 9,000 pounds, according to the Philadelphia Zoo.

Ronda, a five-month-old pygmy hippopotamus, is on display at the Montgomery Zoo. Pygmy hippos, native to west Africa, are an endangered species, with only about 3,000 in the wild.

Two of Philadelphia Zoo's resident hippos got in the Halloween spirit by enjoying a special pumpkin treat.