During physical exertion, the whale must cool itself to prevent hyperthermia (and ultimately brain damage).
It is now believed that this organ becomes engorged with blood, causing the whale to open its mouth to allow cold seawater to flow over the organ, thus cooling the blood.
This thick-bodied species can weigh from 75 to 100 tonnes (74 to 98 long tons; 83 to 110 short tons).
They live entirely in fertile Arctic and sub-Arctic waters, unlike other whales that migrate to low latitude waters to feed or reproduce.
The bowhead whale has a large, robust, dark-colored body and a white chin/lower jaw.Bowhead whales are comparable in size to the three species of right whales.According to whaling captain William Scoresby Jr., the longest bowhead he measured was 17.7 m (58 ft) long, while the longest measurement he had ever heard of was of a 20.4 m (67 ft) whale caught at Godhavn, Greenland, in early 1813.Seemingly identical to its cousins in the North Atlantic, North Pacific and Southern Oceans, they were all thought to be a single species, collectively known as the "right whale", and given the binomial name Balaena mysticetus.Today, the bowhead whale occupies a monotypic genus, separate from the right whales, as was proposed by the work of John Edward Gray in 1821.The tissue is histologically similar to that of the corpus cavernosum of the mammalian penis.