Life On the hunt for thousands of salmon that escaped Icelandic fish farm Some 3500 salmon have escaped from a fish farm pen in Iceland and now the hunt is on to catch them before they hybridise with the local wild, genetically distinct salmon in the fjords NewsSubscriber-only
Life Why birds' eyes can be blue, green, pink or orange Among birds, eyes come in all sorts of colours – and it seems that this helps them compete for mating opportunities and intimidate rivals NewsSubscriber-only