Under the theme “Migratory Birds – Ambassadors for Biodiversity”, World Migratory Bird Day (WMBD) was celebrated for the third time on 10-11 May 2008. Over 136 activities took place in 59 countries around the world to mark World Migratory Bird Day in 2008 and the events helped spread the idea of migratory birds as messengers for the conservation of biodiversity worldwide.
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 Harbo