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Ready-made multiple-choice practice quizzes, hand-checked. Take any free quiz online — every answer comes with an explanation, and every quiz page has a full answer key to revise from.
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Free · no sign-up · no time limit
Ready-made multiple-choice practice quizzes, hand-checked. Take any free quiz online — every answer comes with an explanation, and every quiz page has a full answer key to revise from.
Animals
Discover the realm of tiny wildlife, from miniature vertebrates and tiny mammals to incredible microscopic organisms. Answer each question to see whether you got it right, with an explanation every time.
A free 10-question multiple-choice practice test on Animals. Each question has one correct answer and a short explanation, and the full answer key below the player doubles as a study sheet. No account, no time limit — take it as often as you like.
This is a free, 10-question multiple-choice quiz. Answer each question to see whether you got it right, with an explanation for every answer. There is no sign-up and no time limit — take it as many times as you like, and use the answer key above to revise before or after.
Correct answer: ATardigrade (Water bear)
Tardigrades enter anhydrobiosis, a cryptobiotic state where their metabolic activity drops to near zero, surviving extreme space environments.
Correct answer: AEtruscan shrew
The Etruscan shrew weighs around 1.8 grams, possessing a heart that beats up to fifteen hundred times per minute to maintain its body heat.
Correct answer: ABrookesia nana (Nano-chameleon)
Brookesia nana males measure just over twenty millimeters in total length, living in leaf litter on the rainforest floor of Madagascar.
Correct answer: ABee hummingbird
Endemic to Cuba, the bee hummingbird weighs approximately two grams and measures merely two and a half inches from bill to tail tip.
Correct answer: ARotifer
Rotifers derive their name from the wheel-like corona of beating cilia that propels them and directs organic debris into their jaws (mastax).
Correct answer: AMadame Berthe's mouse lemur
Madame Berthe's mouse lemur weighs only thirty grams, making it the world's smallest living primate species.
Correct answer: AAntarctic krill
Antarctic krill (Euphausia superba) swarm in hundreds of millions, constituting one of the largest single-species biomasses on the planet.
Correct answer: APygmy marmoset
Pygmy marmosets inhabit Amazonian river basin understories, using specialized chisel-like teeth to gouge tree bark for sap.
Correct answer: APseudoscorpion
Pseudoscorpions measure mere millimeters, featuring venom-bearing pedipalps like real scorpions but completely lacking a stinging tail.
Correct answer: APaedophryne amauensis
Paedophryne amauensis averages only 7.7 millimeters in adult body length, living among damp leaf litter on the tropical forest floor.