Willow the white whale swims next to a normal coloured whale off the coast of Spitsbergen, Norway. Dan Fisher was on a boat trip to Svalbard in Norway when he noticed a giant white hump rise from the water. Rushing up a mast to get a better look, he quickly realised he was witnessing one of nature’s rarest sights – a white whale. Its colour is caused by a condition called leucism, caused by a reduction in skin pigment.
Picture: Dan Fisher / Barcroft Media