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Discover how much you really know about sloths with our comprehensive free 47-question trivia quiz with answers. From their incredible slowness to their unique three-toed and two-toed varieties, this quiz covers everything about these fascinating tree-dwelling mammals. Challenge yourself and learn surprising facts about one of nature's most intriguing creatures!
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Q 01Whatever they are called, how many toes does every sloth have on each rear limb?
Three
The 'two-toed' name refers only to the forelimbs; taxonomists have recently split the maned sloth, which is why counts of living species now range between six and seven.
Q 02In what geographical region are sloths primarily found?
Central and South American rainforests
Sloths are native to the tropical rainforests of Central and South America, where they spend most of their lives in the tree canopy.
Q 03Compared to their movement on land, how do sloths typically perform in water?
They are surprisingly faster
Paddling with their long arms, sloths reach about 13.5 metres a minute in water against roughly 4 in the trees, and they can cross rivers and swim between islands.
Q 04What is the primary food source for most sloth species?
Leaves and buds
Two-toed sloths are actually omnivores that will take insects, carrion and fruit, but three-toed sloths live almost entirely on the leaves of a handful of tree species.
Q 05What is a direct consequence of the sloth's very low metabolic rate?
Food digestion takes an exceptionally long time
Food digestion takes an exceptionally long time in a three-toed sloth, slower than in any other mammal, which is what a half-speed metabolism buys.
Q 06Why do sloths move so slowly?
To conserve energy from their low-calorie diet
Sloths maintain a very slow pace to conserve energy, a necessary adaptation given their low-calorie, leaf-based diet and exceptionally slow metabolism.
Q 07What grows in a sloth's shaggy coat, tinting it to blend into the trees?
Green algae
Green algae. The shaggy coat holds moisture and is colonised by green algae, which tint the sloth a mossy green that hides it among the leaves.
Q 08Three-toed sloths climb all the way down to the ground, dig a hole and relieve themselves roughly how often?
About once a week
About once a week, three-toed sloths climb down to urinate and defecate, digging a small hole at the base of the tree and covering it before climbing back up.
Q 09How do baby sloths learn which leaves are safe to eat?
By licking their mother's lips
By licking their mother's lips: infants take leaf fragments from the mother's mouth and learn her preferred trees, such as Cecropia, during the roughly five months they stay with her.
Q 10Roughly how long ago did the two living sloth genera share a common ancestor?
28 million years
Two- and three-toed sloths evolved their tree-hanging bodies independently, called 'one of the most striking examples of convergent evolution known among mammals'.
Q 11Besides sloths, which mammal breaks the rule of seven neck vertebrae?
Manatees
Manatees make do with six; even the giraffe, with its two-metre neck, has the standard seven.
Q 12What is the approximate digestion time for a single leafy meal in a sloth?
Up to a month or more
Up to a month or more. Symbiotic gut bacteria take weeks to ferment the tough, low-energy leaves, giving sloths the slowest digestion rate recorded in any mammal.
Q 13Beyond camouflage, what benefit do the tiny organisms in a sloth's fur provide the animal?
Nutrients
The fur is a small ecosystem of its own, hosting moths that fertilise the growth the sloth then eats.
Q 21Why do the outer hairs of sloth fur grow in the opposite direction from other mammals'?
To provide protection from the elements while hanging upside down.
Because sloths spend most of their lives hanging upside down, their fur grows away from their extremities, providing protection from rain and elements while in this inverted position.
Q 22A young sloth that falls from the canopy may die even if unhurt, because of what?
Its mother will not come down to retrieve it
Its mother will not come down to retrieve it: mothers rarely risk the forest floor, though newborns otherwise stay with them for about five months.
Q 23Why do sloths often frustrate hunters even after being shot from below?
Q 14How many neck vertebrae do three-toed sloths typically have, against seven in most mammals?
Eight or nine
Eight or nine for three-toed sloths, against the seven of most other mammals; two-toed sloths go the other way, with only five to seven.
Q 15On average, how much of each day do wild three-toed sloths spend asleep?
8-10 hours
8-10 hours. Wild brown-throated three-toed sloths fitted with EEG recorders in Panama slept an average of 9.6 hours a day, far less than the roughly 16 hours recorded in captivity.
Q 16What is a major risk for sloths when they descend to the forest floor?
Predation
When sloths descend to the ground, usually to defecate, they become significantly more exposed and vulnerable to predators such as jaguars, ocelots, and anacondas.
Q 17How do heterothermic sloths often compensate for poor control of body temperature?
By sunning themselves
By sunning themselves. Sloths have weak control of body temperature, so they climb to exposed branches to bask in the morning sun and retreat into shade when they overheat.
Q 18Which of these sloths was listed as 'critically endangered' on the IUCN Red List in 2025?
Pygmy three-toed
The pygmy three-toed sloth (Bradypus pygmaeus), which inhabits a single island off the coast of Panama, was assessed as critically endangered.
Q 19On Barro Colorado Island in Panama, sloths make up what share of the biomass of tree-dwelling mammals?
70 percent
70 percent. Surveys on Barro Colorado Island found two- and three-toed sloths made up about 70 percent of the biomass of tree-dwelling mammals, thanks to a leaf diet few other animals can live on.
Q 20Given poor sight and hearing, which two senses do sloths mainly rely on?
Smell and touch
Sloths have poor visual acuity and hearing, especially in bright light, so they primarily rely on their keen sense of smell and touch to locate food and navigate their environment.
They stay hooked in place on the branch
They stay hooked in place on the branch: a sloth's curved claws lock around the limb and keep the body hanging even after death, so a shot animal often never drops to the hunter below.
Q 24Unlike their strictly leaf-eating three-toed cousins, two-toed sloths will also eat which of these?
Small lizards
Small lizards. Two-toed sloths are omnivores whose recorded diet includes insects, carrion, fruit and small lizards alongside leaves, while three-toed sloths feed almost entirely on foliage.
Q 25What percentage of a sloth's total body weight is typically made up of muscle mass?
25-30%
Sloths have a remarkably low muscle mass, making up only 25-30% of their total body weight, compared to 40-45% in most other mammals.
Q 26Which genus of fur-dwelling organism gives sloths their greenish camouflage?
Trichophilus
The predominant species is Trichophilus welckeri, and it is thought to be passed from mother to young rather than picked up from the forest.
Q 27On three-toed sloths, how much longer are the arms than the legs?
50 percent
50 percent. A three-toed sloth's forelimbs are about half again as long as its hind limbs; those long arms do most of the work as it pulls itself hand over hand along branches.
Q 28How big could extinct ground sloths such as Megatherium grow?
As big as an elephant
Ancient ground sloths, like Megatherium, were massive, with some species growing to the size of modern-day elephants.
Q 29The name of the mammal order Pilosa, to which sloths belong, comes from the Latin for what?
Hairy
Hairy. Pilosa comes from Latin pilosus, 'hairy', a nod to the shaggy coats of its members; sloths make up its suborder Folivora, meaning 'leaf-eaters'.
Q 30Sloths are most closely related to which animals, sharing the order Pilosa with them?
Anteaters
Anteaters are sloths' closest relatives; the two together make up the order Pilosa within the superorder Xenarthra.