mammal

An artist's impression of Nimbadon

Nimbadon lived 15 million years ago, in forests with flesh-eating kangaroos and tree-climbing crocodiles. Our first look inside their fossilised bones has revealed how these giants grew.

Platypus 1

Scientists are a step closer to discovering what determines the sex of Australia’s iconic platypus and echidna, after an international study unravelled new genes contained on mammalian Y chromosomes.