IDBHP postcard from ASCOBANS.
In 2002, the Agreement on the Conservation of Small Cetaceans in the Baltic, North East Atlantic, Irish 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 for populations of the Harbour Porpoise (Phocoena phocoena): the only species of cetacean native to the Baltic Sea.