'Killed in vast numbers': Horseshoe crabs under threat from overharvesting

The crabs' blue blood is used to test vaccines, saving millions of lives - but there are synthetic alternatives They are some of the most spectacular images currently on display at the Wildlife Photographer of the Year exhibition in London. Huge pictures of weird creatures with golden carapaces and multiple legs scuttling across the seabed now adorn the walls of the city's Natural History Museum. The award-winning photographs, taken by Laurent Ballesta, could be visions of extraterrestrial lifef...