This huge ancient sawfish had harpoons on its face

Sawfish are about as bizarre as they come. And yet, even these uniquely strange fish have even stranger ancient cousins. Meet Onchopristis, a prehistoric animal whose "face saw" was covered in backward-facing barbs like so many little harpoons.

The Vancouver aquarium ends its dolphin programme, trouble for yellow-eyed penguins, over 300 tortoises seized in a poaching bust, a rare dolphin behaviour and dogs team up to save koalas! All that and more in this week’s roundup of nature news.

Crafty orcas float shark livers like tasty buoys

The washed-up carcasses of three great whites in Gansbaai, South Africa have shed some light on an orca hunting strategy with a surgical slant.