Why Are Sloths So Slow? The Answer Lies in Their Guts

When it comes to physical activity, few animals have as maligned a reputation as the sloth. The six sloth species, which call Brazil and Panama home, move with no urgency, having seemingly adapted to an existence that allows for a life lived in slow motion. But what makes sloths so sedate? And what horrible, poop-related price must they pay in order to maintain life in the slow lane?

1. Sloths Take a Leisurely Approach to Life
2. Sloths Have Stamina

Sloths Take a Leisurely Approach to Life

The sloth’s limited movements are primarily the result of their diet. Residing mainly in the canopies of Central and South American forests, sloths dine out on leaves, fruits, and buds. With virtually no fat or protein in their meals, sloths conserve energy by taking a leisurely approach to life. On average, a sloth will climb or travel about 125 feet per day. On land, it takes them roughly one minute to move just one foot. The video below shows a three-toed sloth in [in]action:

A sloth’s digestive system matches their locomotion. After munching leaves using their lips—they have no incisors—it can take up to a month for their meals to be fully digested. And a sloth’s metabolic rate is 40 to 45 percent slower than most mammals’ to help compensate for their low caloric intake. With so little fuel to burn, a sloth makes the most of it.

You May Also Like:

• 16 Animals With Delightfully Obvious Names
• 7 of the Oldest Animals on Earth
• 13 Chill Facts About Sloths

Add Mental Floss as a preferred news source!

Sloths Have Stamina

Deliberate movement shouldn’t be confused for weakness, however. Sloths can hang from branches for hours, showing off some impressive stamina. And because they spend most of their time high up in trees, they have no need for rapid movement to evade predators.

There is, however, one major downside to the sloth's leisurely lifestyle. Owing to their meager diet, they typically only have to poop once per week. Like going in a public bathroom, this can be a stressful event, as it means going to the ground and risking detection by predators—which puts their lives on the line. Worse, that slow bowel motility means they’re trying to push out nearly one-third of their body weight in feces at a time. It's something to consider the next time you feel envious of their chill lifestyle.

A version of this story originally ran in 2020; it has been updated for 2025.