Mammals
The warm-blooded branch: from a bumblebee-sized bat to the blue whale.
The first mammals have arrived; the full branch is growing.
Where mammals sit on the tree
Meet the stars
★ Blue WhaleWhen the Ocean Sang BackThe blue whale, the largest animal that has ever lived, sings a call so deep and powerful it can travel hundreds of kilometers through the sea.3 min story
★ PlatypusHow to Be ImpossibleThe platypus seemed so impossible in 1799 that scientists searched its skin for stitches, yet it truly lays eggs and hunts by sensing electricity.3 min story
★ African Bush ElephantThe Voice Too Deep to HearElephants call to each other in rumbles too low for people to hear, felt through the ground for kilometres.3 min story
★ Naked Mole-ratThe Queen With a Hundred DiggersOne queen has all the babies while dozens of workers dig, and she can live more than 30 years, almost never getting cancer.4 min story
★ Sperm WhaleThe Whale Who Saw With SoundA sperm whale makes the loudest sound of any animal, using it to see in the pitch-dark depths where she hunts squid.3 min story
★ GiraffeThe Calf Who Fell Into the SkyA giraffe's two-metre neck holds the same seven bones as a person's, just much longer.3 min story