Rhino horn trade is estimated to be worth just under $10 billion a year, with animals dying in great numbers to meet an appetite from unscrupulous dealers supplying people mainly in Asia. Sue Lloyd-Roberts reports from Vietnam for Newsnight.

From huge dogs to tiny dogs, working dogs to lap dogs, hairy dogs to hairless dogs – the team investigates why this single species comes in so many shapes and sizes. Set in a typical English village, the team uses DNA science to reveal the sometimes surprising family trees of some of the village dogs. […]