Sloths can hold their breath longer than what aquatic animal?

Sloths can hold their breath longer than dolphins. By slowing their heart rate and reducing their already low metabolic activity, sloths can remain underwater for up to about 40 minutes, according to widely cited zoological accounts.

This ability is surprising because sloths are primarily tree-dwelling mammals, not aquatic specialists. They can swim using a dog-paddle motion and may cross rivers or flooded areas. Their slow lifestyle is important here: sloths eat low-calorie leaves, have an unusually low metabolic rate and conserve energy whenever possible.

Dolphins are also highly adapted to breath-hold diving. They slow their heart rate during dives, store oxygen efficiently in their blood and muscles, and can remain submerged for many minutes. A bottlenose dolphin may stay underwater for up to roughly 20 minutes, although typical dives are often shorter and vary with activity and species.

The comparison is a maximum-duration fact, not a claim that sloths are better divers. Dolphins are streamlined, powerful swimmers built for repeated underwater travel, while a sloth’s long breath hold is mainly an energy-saving response. The familiar “40 minutes” figure is best treated as an upper estimate rather than a universal limit for every sloth.