How it works
What does every mammal have that no other animal has, and why does a sloth look green? These mammal trivia questions and answers cover the whole class, from shrew-sized fossils to prairie dog alarm calls.
Read the full guide
Five rounds on a whole class of animals
What makes a mammal counts neck bones and names the brain region no other animal has. From the first mammals runs from the cynodonts to the cave at Lascaux. Fur, color and voice explains blue skin and why small mammals call in ultrasound. Moving and feeding sorts toe-walkers from knuckle-walkers. Signals, groups and people reads alarm calls and tail flags.
For a biology class or a zoo quiz
Play runs in sets of ten. A tapped choice turns right or wrong at once, and a short reason and the source article follow. Scored round withholds the marks until twenty are done.
Questions and answers
What makes an animal a mammal?
Milk and hair, above all. Mammals feed their young from milk-producing glands and have fur or hair, a broad neocortex in the brain and three middle ear bones.
Do all mammals give birth to live young?
No. All modern mammals do except the five species of monotreme, the platypus and four echidnas, which lay eggs.
Are whales and bats mammals?
Yes. Whales are fully aquatic mammals that have lost their legs and swim with a tail fin, and bats are the only mammals that can truly fly.
How were the answers checked?
Each was read on October 3, 2026 in the English Wikipedia article Mammal, which every question links. Species counts, record sizes and ages, and figures that a new survey would change are left out.