Last Friday, two young sperm whales washed up dead on the German island Wangerooge. This had never happened before on this island. One was 13 meters long and the other one 12 meters. Sperm whales live in warmer tropical and subtropical waters. Only males depart regularly to northern waters and may end up in the North Sea. The Dutch and German parts of the North Sea are too shallow for sperm whales. Their chance of survival is small.