Hippo

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.

Hippos are some of the world's deadliest animals, killing hundreds of humans a year.

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.

At least 12 people have been killed; authorities search for lions, tigers and bears.

The animals have been multiplying quickly since they escaped from the drug lord's private zoo in 1993

Olivia, born in an international breeding program, is affectionately called "a little Michelin Man" by zoologists