A security expert warns that the move to GSM-R communication technology could allow hackers to disrupt rail travel.

Elvis the Australian crocodile steals, drowns and guards a noisy lawnmower - forcing park keepers to make a daring rescue.

Scotland's biggest horse mussel bed and a "faceless and brainless" fish were recorded during government-backed surveys this year.

A rogue wave has damaged an anti-whaling vessel in the Southern Ocean, as it followed the Japanese whaling fleet.

More elephant tusks were seized in 2011 than in any year since 1989, when the ivory trade was banned, international wildlife trade group Traffic says.