Mammal
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99 free Mammal trivia questions with answers — nature quiz, new questions added Sep 2026.
10 free mammal trivia questions with answers. Think you know mammals? Put your knowledge to the test with our engaging trivia quiz featuring 5 challenging questions about the animal kingdom's most diverse class. From tiny shrews to massive whales, mammals dominate Earth's ecosystems in remarkable ways. See how many questions you can answer correctly!
30 of 99 questions with answers and explanations. Play the quiz
Q 01Which of these features is found in mammals and in no other class of animal?
Mammary glands
Mammary glands mark the class, while birds share the four-chambered heart and warm blood. The platypus has the glands but no teats, so its milk seeps out through pores in the skin.
Q 02What is the largest mammal on Earth?
Blue whale
Blue whale: the largest animal known ever to have lived reaches about 30 metres, yet it feeds almost entirely on krill, straining them from huge mouthfuls of sea water.
Q 03The platypus and the echidnas form which group of mammals, the only ones that lay eggs?
Monotremes
Monotremes means 'single opening' in Greek: unlike most mammals, they have one vent that serves for waste, mating and laying eggs.
Q 04Which land mammal is recognized as the fastest over short distances?
Cheetah
Cheetah: it reaches highway speed in about three seconds, but a full sprint lasts well under a minute, so it stalks close to its prey before it charges.
Q 05Echolocation is shared with whales and shrews, so which ability is unique to bats among mammals?
Sustained flight
Sustained flight is theirs alone, since flying squirrels and sugar gliders only glide. Wings took bats where other land mammals never reached: they are New Zealand's only native land mammals.
Q 06Most of the world's living marsupial species are found on which continent and its nearby islands?
Australia
Australia is where they flourished, not where they began: DNA points to a single migration from South America, made while Antarctica still linked the two continents.
Q 07Which animal carries its young for around 22 months, the longest gestation of any mammal?
African elephant
African elephant: after a pregnancy of nearly two years the calf is born so well developed that it is on its feet soon after birth.
Q 08Two of a mammal's three middle-ear bones began as bones of which body part?
Jaw
The jaw once hinged on them: when early mammals evolved a new jaw joint, the two old hinge bones shrank and moved into the ear, becoming the hammer and anvil.
Q 09A whale's blowhole is the evolved form of which body part found on other mammals?
Nostrils
Nostrils: over millions of years they moved to the top of the head, so a whale can take a breath while almost all of its body stays under water.
Q 10Lemurs, tarsiers, monkeys, apes and humans all belong to which order of mammals?
Primates
Primates means 'of the first rank' in Latin, coined for what was seen as the highest order of mammals, and the group as first drawn up also included bats.
Q 11Llamas and alpacas of South America belong to the same family as which Old World animals?
Camels
Camels share the family, which first appeared in North America and only later spread over land bridges to Asia and South America.
Q 12A porcupine's quills are a modified form of which body covering?
Hair
Hair is what each quill is, thickened into a barbed spine. No porcupine can throw its quills, but they detach easily and the barbs work them deeper into an attacker.
Q 13Which is the largest order of mammals by number of species?
Rodents
Rodents make up about 40% of all mammal species, and the name comes from the Latin for 'gnawing': their front teeth never stop growing, so they must keep wearing them down.
Q 21The bat order name Chiroptera comes from Ancient Greek words meaning what?
Hand wing
Hand wing: a bat's wing is skin stretched across four greatly lengthened fingers, so the animal in effect flies on its hands.
Q 22Guinea pigs were first domesticated in which mountain range?
Andes
Andes villagers have bred guinea pigs for meat for thousands of years, and still do: the animal Europe adopted as a pet is neither a pig nor from Guinea.
Q 23True seals have only ear holes, so which of their relatives can be told apart by small external ear flaps?
Sea lions
Sea lions belong to the eared seals, and they can also turn their hind flippers forward to walk on all fours, while a true seal on land has to wriggle along on its belly.
Q 14Which prehistoric animal, often mistaken for a dinosaur, was in fact an early relative of mammals?
Dimetrodon
Dimetrodon died out some 40 million years before the first dinosaurs appeared, and it belongs to the synapsids, the line that led to mammals rather than to reptiles.
Q 15A beaver's front teeth are orange because their enamel contains which metal?
Iron
Iron compounds colour the enamel and make it harder and more resistant to acid, which helps teeth that never stop growing stand up to a lifetime of cutting wood.
Q 16Which is the largest living ape?
Gorilla
Gorilla: for all its size and strength it is a quiet plant-eater, living mainly on leaves, stems and fruit.
Q 17Naturalists who saw the first platypus specimen suspected a fake, with which part sewn onto another animal's body?
Its bill
Its bill looked so like a duck's that George Shaw, who first described the animal in 1799, wrote that it was impossible not to doubt it was genuine.
Q 18Where does the male platypus deliver its venom from?
A spur on each hind foot
A spur on each hind foot is wired to a venom gland in the leg; only males keep the spurs into adulthood, and the sting is strong enough to cause a person severe pain.
Q 19Which animal, at around two grams, is the world's smallest mammal by mass?
Etruscan shrew
Etruscan shrew: to keep so small a body warm it burns energy at a furious rate, and its muscles contract faster than those of any other mammal.
Q 20Kitti's hog-nosed bat, a rival for the title of smallest mammal, lives in Myanmar and which neighbouring country?
Thailand
Thailand: it roosts high in limestone caves there, and at about two grams it is no bigger than a large bumblebee, which is why it is also called the bumblebee bat.
Q 24An elephant's tusks are modified versions of which teeth?
Incisors
Incisors: each tusk is an upper front tooth that keeps growing throughout the elephant's life, by several inches a year, and serves as a tool for digging, stripping bark and fighting.
Q 25Which mammal lives in underground colonies run like a beehive, with a single breeding queen?
Naked mole-rat
Naked mole-rat colonies work like those of ants and bees: only the queen and one to three males breed, while every other member spends its life as a worker or soldier.
Q 26Which farm animal stands on the tip of a single toe on each foot?
Horse
Horse: each hoof caps the one toe it has left, the legacy of dog-sized ancestors that walked on four toes in front and three behind some 50 million years ago.
Q 27Which Arctic whale may be the longest-lived of all mammals, reaching more than 200 years?
Bowhead
Bowhead whales landed by Alaskan hunters have carried harpoon tips more than a century old, the first hard evidence of a lifespan that no other mammal is known to match.
Q 28A wild sloth's fur often looks green because what grows in it?
Algae
Algae grow in grooves that run along each strand, and the greenish tint helps hide the slow-moving sloth in the canopy from predators that hunt by sight.
Q 29Sloths are most closely related to which other animals, together making up the order Pilosa?
Anteaters
Anteaters and sloths look nothing alike, yet they share an order, and their next nearest relatives are the armadillos: all three groups arose in South America.
Q 30Which mammals, poached for their meat and scales, are the world's most trafficked?
Pangolins
Pangolins roll into a tight ball when threatened, their overlapping scales working as armour, but that armour is what poachers are after: the scales are sold for use in traditional medicine.