A late September video shot inside months-old Moo Deng’s enclosure within Thailand’s Chonburi zoo showed the feisty female coming at her caretaker, while he was attempting to hose her down. Although tiny, the dense but cute beast managed to push the grown man — while latching onto his leg and refusing to let go.

Some of the most popular and recirculated clips of Moo Deng feature her stomping about, nipping her handler, wriggling and fighting her bath time and traipsing around with her mou

The Franklin Park Zoo's family of pygmy hippos hasn't gone quite as viral as Internet sensation Moo Deng, but they're still our own slimy, adorable hometown hippos. Why it matters: Ptolemy, the zoo's youngest pygmy hippo,