Fin whale is the second largest animal after the Blue Whale.
It can grow to a length of 26m (85ft) and weigh 30-80 tonnes
but on the average it is much smaller. The Fin whale is
called a "rorqual" a Norwegian word for "furrow" and refers
to the pleated grooves running from its chin to its navel.
The throat grooves, in addition to streamlining the shape
of the whale, allow the throat area (cavum vent-rale) to
expand tremendously during feeding. This allows the taking
in of tonnes of food-laden water which is then discarded
through their baleen plates leaving the fish or krill for
swallowing. This efficient system enables the largest animals
on earth to feed on some of the smallest. They eat krill,
small fishes, and squid.