BLAME it on the bunnies. The debate over what Neanderthals ate, and how it may have led to their demise, has turned to rabbits. Which, it is now claimed, Neanderthals did not feast on.

Signs that our extinct cousins hunted dolphins and seals were presented in 2008 as evidence of their sophistication. But, experts claimed in 2009, they weren't clever enough to catch fish or birds – which could have given our ancestors an edge. Then came the discovery of fish scales and feathers on Neanderthal tools.

Now, John Fa of the Durrell Wildlife Conservation Trust in Trinity, Jersey, says Neanderthals eventually bit the dust because they were unable to adapt their hunting to small animals like rabbits.