Megalodon may not have been quite so mega, controversial study suggests

Meet the prehistoric giants that roamed the Arctic Circle thousands of years ago

Q What are some of the longest lifespans in fish? A Technically the longest lifespan lies with the Greenland shark, which live a staggering 250-plus years – perhaps even more than 500, in some cases.

With its baleful stare and lupine grin, the Death Metal anti-hero of the subaqueous scene enjoys a diabolical reputation

Cassie Malson-Dixon reports back from Pembrokeshire where it was only girls allowed on an all-female shark hunting expedition

FROZEN PLANET

ANCIENT HORNS Woolly rhinos prepare to do battle ...