Sloths Can Hold Breath 40 Minutes

While famous for their leisurely life in the treetops, sloths are surprisingly capable swimmers, often paddling through rivers to find new food sources or mates. It is during these aquatic journeys that they reveal a remarkable adaptation. Their ability to remain submerged far outlasts that of many marine mammals; for instance, a dolphin typically needs to surface after about 10 minutes, but a sloth can stay under for up to four times as long.

This incredible feat is a direct result of their famously slow metabolism. The same biological system that governs their unhurried pace on land allows them to perform an extreme act of energy conservation underwater. A sloth can intentionally slow its heart rate to less than a third of its resting pace, drastically reducing the body's need for oxygen. By sipping on their internal oxygen reserves so efficiently, they can comfortably spend up to 40 minutes submerged, a survival skill essential for navigating the flooded forests they call home.