1. In 2002, the Agreement on the Conservation of Small Cetaceans in the Baltic and North Seas (UNEP/ASCOBANS) declared the third Sunday in May of each year as the International Day of the Baltic Harbour Porpoise (IDBHP) in order to raise awareness of the critical situation of the populations of Harbour Porpoises (Phocoena phocoena), the only species of cetacean native to the Baltic Sea.