"What better way to kick off summer than a good old fashioned hippo watermelon smash?!" the San Antonio Zoo captioned the now-viral video.
There hasn't been extensive research, but people who have spent time around hippos have a definitive answer about their "personalities."
"Screaming, adoring fans make her very happy," Christina Gorsuch, the curator of mammals at the Cincinnati Zoo & Botanical Garden, told Newsweek.
A study on mice shows inhibiting a certain signaling pathway may allow the organ to simply mend itself.
Bertha the hippo had been living at the Manila Zoo in the Philippines since 1959.