Dead sperm whales are seen on a beach on Texel Island, The Netherlands, January 13, 2016. The five sperm whales that beached on the Dutch island of Texel on Tuesday have died overnight, Dutch media reported. Necropsy of the 29 sperm whales that washed upon the shores of Great Brittany, France, the Netherlands and Germany in January 2016 revealed that almost a third of them had large quantities of plastic waste in their stomachs. Noise pollution of the sea is another cause by human activities why so many of these giant sea animals are stranding dead, since their navigation system is working with sound and echo.