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100 free Mammal trivia questions with answers — nature quiz, new questions added Aug 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 100 questions with answers and explanations. Play the quiz
Q 01Which of these features is found in mammals and in no other class of animal, birds included?
Mammary glands
Mammary glands are the giveaway: birds are also warm-blooded with four-chambered hearts, and every vertebrate has a spine. Even the egg-laying platypus nurses, sweating milk through patches of skin.
Q 02What is the largest mammal on Earth?
Blue whale
It is the largest animal known ever to have lived, at up to about 30 metres and 190 tonnes, bigger than any dinosaur.
Q 03The platypus and the four echidna species form which group of mammals, the only ones that lay eggs?
Monotremes
Just five living species of monotremes exist, and despite the eggs they still feed their young with milk, the defining mammal trait.
Q 04Which land mammal is recognized as the fastest over short distances?
Cheetah
A cheetah can run down an antelope given a 137-metre head start, built for it with powerful hindlimbs, long limbs and a flexible spine.
Q 05What unique physical ability do bats possess among all mammals?
Sustained flight
Flying squirrels, colugos and sugar gliders can only glide. Echolocation is not unique either: some shrews and tenrecs, and toothed whales, use it too.
Q 06Close to 70% of the world's 334 living marsupial species are concentrated on which continent and its nearby islands?
Australia
Australia, with Tasmania and New Guinea, holds most of them. The name comes from marsupium, Latin for the abdominal pouch in which the underdeveloped young are raised.
Q 07Which animal carries its young for around 22 months, the longest gestation of any mammal?
African elephant
The female's reproductive cycle is correspondingly slow, lasting several months between seasons, and calves are born weighing around 100 kilograms.
Q 08How many middle-ear bones set mammals apart from other vertebrates?
3
A broad neocortex region of the brain is the other feature commonly listed among the defining traits.
Q 09Whales, dolphins and porpoises are grouped together in which infraorder of fully aquatic mammals?
Cetacea
Despite their fish-like shape they must surface to breathe air, and they sit within the order Artiodactyla, alongside hoofed animals.
Q 10Lemurs, tarsiers, monkeys, apes and humans all belong to which order of mammals?
Primates
Carl Linnaeus named the Primates because he considered them the highest order of animals. Lemurs are strepsirrhines; tarsiers, monkeys and apes are haplorhines.
Q 11The word 'mammal' comes from the Latin word mamma, meaning what?
Breast
Around 6,640 living species have been described, split across 27 orders.
Q 12Roughly how many living mammal species have been described?
About 6,600
Rodents, bats and eulipotyphlans such as hedgehogs and shrews are the largest orders by species count.
Q 13Which is the largest order of mammals by number of species?
Rodents
Bats come second, accounting for about 20% of all classified mammal species.
Q 14Mammals are the only living members of which larger clade of amniotes?
Q 21The bat order name Chiroptera comes from Ancient Greek words meaning what?
Hand wing
With at least 1,500 species, bats make up about 20% of all classified mammals.
Q 22The archaic English name 'camelopard' for the giraffe combines 'camel' with which other animal?
Leopard
The Greek word referred to its camel-like shape and spotted colouring; Linnaeus first filed it as Cervus camelopardalis in 1758.
Q 23As of 2025, how many living species of elephant were recognised?
Three
They are the African bush, African forest and Asian elephants; the African species have larger ears and concave backs.
Synapsida
Early members of the group are called pelycosaurs, and mammals arose from cynodonts around the Triassic-Jurassic boundary.
Q 15Mammals originated from cynodonts, an advanced group of what?
Therapsids
That happened during the Late Triassic to Early Jurassic, long before mammals dominated after the dinosaurs' extinction.
Q 16How many living species of egg-laying mammals are there?
Five
They are the platypus and four species of echidna.
Q 17In 1799, the first scientists to examine a preserved platypus concluded it was what?
A fake sewn from several animals
Robert Knox even suspected Chinese sailors had assembled it, since it arrived via the Indian Ocean.
Q 18Where does the male platypus deliver its venom from?
A spur on each hind foot
It is one of the few venomous mammals, and it also hunts using electrolocation with its eyes, ears and nostrils shut.
Q 19Which animal, weighing about as much as a paperclip, is the world's smallest mammal by mass?
Etruscan shrew
It averages 1.8 grams and its heart can beat up to 1,511 times a minute.
Q 20Kitti's hog-nosed bat, arguably the smallest mammal, lives in Myanmar and which other country?
Thailand
Also called the bumblebee bat, it measures just 29 to 33 mm and weighs about 2 grams.
Q 24An elephant's tusks are modified versions of which teeth?
Incisors
They serve as weapons and as tools for digging and moving objects.
Q 25The naked mole-rat is the only mammal that is almost entirely cold-blooded. What term describes this?
Thermoconformer
It is also eusocial, lacks pain sensitivity in its skin, and is famously resistant to cancer and low oxygen.
Q 26Which is the only other known eusocial mammal besides Heterocephalus glaber, the hairless East African burrower?
The Damaraland mole-rat
Eusociality means a reproductive division of labour with castes and cooperative care of young, as in ants and bees.
Q 27Which cetacean may be the longest-lived of all mammals, reaching more than 200 years?
Bowhead
It is the only baleen whale endemic to Arctic waters and uses its huge triangular skull to break through ice.
Q 28How many toes do all sloths have on each rear limb, regardless of their common names?
Three
Two-toed sloths only differ by having two digits on each forelimb; there are seven living species in two genera.
Q 29Sloths are most closely related to which other animals, together making up the order Pilosa?
Anteaters
Sloths and anteaters are xenarthrans, a group native to the Neotropics that also includes the armadillos, which sit in a separate order.
Q 30Which mammals, poached for meat and keratin scales, are the world's most trafficked?
Pangolins
All eight recognised species are threatened, and the order name Pholidota means 'clad in scales' in Greek.