Ancient sloths ranged in size from tiny climbers to ground-dwelling giants. Now, researchers report this body size diversity was largely shaped by sloths’ habitats, and that these animals’ precipitous ...

While humans wouldn’t be very happy to find that organisms were growing on their skin, particularly fungi, algae, and insects, it works out pretty well for sloths. Sloths may be hosting entire ...

Sloths, whose closest relatives are armadillos, are herbivores and also technically folivores — animals who eat the leaves and shoots of trees. Once they’ve made their way to a training session, ...