For the first time in 500 years, a gray seal pup was born in the Danish Wadden Sea. Just before the end of 2014 at a secluded sandbank a mother with a youngster was seen during a count from an airplane. For several years already, adult gray seals swam in the Danish Wadden Sea, but there is still no permanent colony. And yet since the eighties of the last century this seal species is back in the Netherlands and in Germany and propagates there.
The gray seal was until the 10th century the most common species of seal in the Wadden Sea. But there was severe hunting pressure on them and in the 16th century the population had disappeared.
Albino grey seal: here.