Earliest horsepeople, whales use ‘vocal fry’, plankton might migrate poleward, mapping a fruit fly brain and understanding the cuddly, cute and really strange koala
54:02
5,000 years ago riding left traces on the legs and butts of the earliest horsepeople; Whales use ‘vocal fry’ to echolocate at depth; Fossils suggest that if equatorial oceans get too warm, plankton may desert; Scientists have mapped the most complex animal brain yet - and it's the size of a grain of salt; A new book explores the unique biology and uncertain fate of Australia’s iconic koala.