Animals & Nature
Sloths Quiz
Test 50 trivia questions on sloths — two-toed vs three-toed, algae fur, Costa Rica, and the world's slowest mammal.
Test 50 trivia questions on sloths — two-toed vs three-toed, algae fur, Costa Rica, and the world's slowest mammal.
Sloths only descend from trees once a week to defecate — and that's when 20% of natural-cause sloth deaths happen, making it the most dangerous activity of their slow lives. From the pygmy three-toed sloth clinging to one tiny island off Panama to algae-tinted fur that hosts entire ecosystems of moths, this quiz dives into the strange biology and conservation status of these arboreal Neotropical mammals.
Each round presents 10 randomized questions from a pool of 50, with four multiple-choice options and instant feedback after every answer. Your final score comes with a performance tier and shareable results.
You'll explore the six living sloth species, the differences between Bradypus and Choloepus, the symbiosis with sloth moths and cyanobacteria, the giant ground sloths of the Pleistocene, the Costa Rica sloth-tourism scene, and why hanging upside down has dictated nearly every detail of sloth anatomy.
Their leaf-only diet provides extremely little energy, so they conserve calories with low muscle mass, low metabolism, and a body temperature that fluctuates with the environment — much closer to ectothermic than most mammals.
All sloths have three toes on their hind feet — the difference is the number of fingers on the front limbs. Two-toed and three-toed sloths are also in different families and last shared an ancestor around 30 million years ago.
Cyanobacteria and algae grow in the grooved hairs of sloth fur, tinting it green for camouflage. The fur also hosts sloth moths, beetles, and other invertebrates in a unique miniature ecosystem.
Last updated: May 2026