Why a 3-Legged Lion and His Brother Swam Across a Crocodile-Filled River

On a dark night in February, two male lions stood in the shallows of the Kazinga Channel in Queen Elizabeth National Park, in Uganda, and looked across the water. Nearly a mile away was the shore on the other side. Hippos and 16-foot crocodiles inhabit the channel, which can be 20-feet deep in places.

Barely 12 hours earlier, the two males had lost a battle for territory and were lucky to still be alive. Remaining on this side of the channel was dangerous, and they could probably hear the roars of female lions in the distance.

As with many cat species, lions don’t like to swim. And one of the lions, known as Jacob by researchers, has only three legs. He lost a limb in a poacher’s trap in 2020. But neither Jacob nor his brother, Tibu, were deterred. The two big cats set out for what the researchers call the longest-recorded swim ever taken by lions. The scientists describe their findings in a paper that has been accepted for publication in the journal Ecology and Evolution.

The lions struggled on their first three tries to cross. During the second attempt, the drone that was tracking them picked up a large thermal signature that may have been a crocodile or a hippo in pursuit; the two male lions split into a Y formation before hurrying back to shore.

Less than an hour after their first attempt, the two set out again for a third time. The path seemed clear and they kept going until they crossed the channel.