The fin whale is the second largest animal to ever live, in the entire history of Earth.
Reaching lengths of at least 85 feet (26 m) and weights of 80 tons, this species is second only to its close relative, the blue whale.
Their incredible size is only possible because of their aquatic lifestyles and the buoyancy provided by seawater.
On land, an animal as large as the fin whale would almost certainly be crushed under its own weight.
Interestingly, though they are enormous, fin whales are not predatory.
They filter feed for tiny krill or small pelagic fishes and are totally harmless to people (other than through accidental collisions).
This life history strategy is common among several large animals in the ocean, including the whale shark, the basking shark, and the other great whales.
Like all whales, fin whales are mammals and give live birth to very large calves (21 feet/6.5 m).
Because the female is responsible for providing milk for its babies, she must store extra energy reserves and is consequentially larger than males.
All of the record fin whales (by size) are females. The killer whale is the only species known to attack and eat fin whales (always juveniles).
Fin whales are known for the strange color pattern on their heads. Like many open ocean species, the back is dark while the underside is white.
On the head, however, the coloration is asymmetric, with the right lower jaw being mostly white and the left lower jaw being mostly dark.
Fin whales have a truly global distribution and live in every ocean except the parts of the Arctic that remain covered with ice throughout most of the year (including summer).
There are three distinct subspecies of fin whales (North Atlantic, North Pacific, and southern hemisphere),
and individuals are known to undergo very long migrations between feeding grounds near the poles and calving grounds in the tropics.
Their very large size may help fin whales (and other migrating animals) survive such long trips through waters that may provide relatively little food.
Fin whales are thought to live for nearly 150 years.
Though they are surprisingly fast, fin whales were a favorite target of commercial whaling operations during the middle of the 20th century, and they were hunted into the 1980s.
In fact, Iceland recently (2006) reestablished a commercial hunt of fin whales, so even today, the species is threatened by hunters.
Experts continue to view them as endangered (highly vulnerable to extinction).
In addition to newly reestablished hunts, a primary threat to fin whale recovery is accidental interactions with fishing gear and with ships, and scientists do not know the direction of their population trends.
However, without continuing protection, this species, particularly the north Atlantic Ocean subspecies could be at an increasing risk of extinction.
Ref: uk.whales, britannica, oceana, wikipedia, fisheries.noaa, worldwildlife
Pic: wikipedia, fisheries.noaa, worldwildlife, uk.whales, iwc