Blue whales can weigh up to 200 tons, yet their diet consists almost entirely of tiny crustaceans called krill.
Extensive egg collection and bycatch in fishing gear are the primary causes of these declines.
Scientists believe an hit the Earth.
Where to see them responsibly? It was first discovered in 1992 in the Annamite Range in Vietnam, an event so exciting it was hailed as one of the most spectacular zoological discoveries of the 20th century.
They are also known as the Far East leopard, the Manchurian leopard and Korean leopard.
Unlike all other cetaceans the animal group that contains all whales, dolphins and porpoises , the species swims on its side.
Fish Farmer, 30 March 2007.
If people know, they can take action.