Land Mammals

Ugandan lion brothers Jacob and Tibu were filmed swimming a mile across the Kazinga Channel in Uganda — the longest swim ever recorded for the species —after getting their "butts kicked" by rival males.

Qinling pandas were officially recognized as a subspecies in 2005, but the mystery of their brown fur was only resolved almost two decades later.

Camera traps in Indonesian Borneo recorded a clouded leopard mother with her two cubs in the first footage of its kind.

Visitors at a tiger reserve in India recently filmed an encounter between a tigress and a bear, with the bear charging after the tigress but deciding at the last minute it was not worth the fight.

Wolf 907F recently gave birth to her 10th litter of pups, which researchers say is likely a Yellowstone National Park record.

There is "high potential" for hogs that have gone feral in Canada to cross into South Dakota, North Dakota, Montana and Minnesota, where the pigs could inflict billions of dollars in damage.

Aardwolves — the "weird cousin" of the hyena world that has peg teeth and only eats insects — are an evolutionary mystery, stemming from a ghost lineage that scientists haven't been able to figure out.

A new study debunks the idea that domestic dogs specifically evolved puppy dog eyes to tug on our heartstrings.

Birman and Burmese cats live the longest, while Sphynx cats die the youngest, a giant new study of U.K. cats found.

Elephants use ear flaps, rumbles, trunk reaches and other forms of communication to greet peers, new research suggests.