The water around Denmark has gotten warmer. Now, the invasive Pacific Oyster (Crassostrea Gigas) can survive in Danish territory. It was spotted on the west coast for the first time in 1999. Since then, it has spread to the rest of the country, and during recent years, its even been possible to find it in Copenhagen. Some areas it can become a threat to the Blue Mussel (Mytilus Edulis) and thus some of the birds feeding from it. Luckily, humans can eat the new type of oyster. On the picture: Pacific Oyster from Øresund Source: Øresundsakvariet (Aquarium belonging to the Deparment of Biology at University of Copenhagen)