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Evolution

Can wild animals become overweight?

Under our care dogs and horses can get fat just like human beings. But can animals in nature get too fat?

Rudolph and relatives have UV vision

The reindeer of the high north can see light that is invisible to our eyes. This is a big advantage in a snow white landscape.

All eyes on sea urchins

It doesn’t have normal eyes – it sees with its entire body. Special light-sensitive cells turn this spiny ball of a creature into an optical organ.

Whale keeps its beak shut to avoid being eaten

Beaked whales only 'talk' to each other deep below the surface of the ocean. A new study shows that when close to the surface they keep quiet to avoid falling prey to predators.