  thumb|whale blubber blubber is a thick layer of vascularized adipose tissue found under the skin of all cetaceans, pinnipeds and sirenians. ==description== lipid-rich, collagen fiber-laced blubber comprises the hypodermis and covers the whole body, except for parts of the appendages, strongly attached to the musculature and skeleton by highly organized, fan-shaped networks of tendons and ligaments. it can comprise up to 50% of the body mass of some marine mammals during some points in their lives, and can range from  thick in dolphins and smaller whales, to more than  thick in some bigger whales, such as right and bowhead whales. however, this is not indicative of larger whales' ability to retain heat better, as the thickness of a whale's blubber does not significantly affect heat loss. more indicative of a whale's ability to retain heat is the water and lipid concentration in blubber, as water reduces heat-retaining capacities, and lipid increases them. ==function== blubber is the primary storage location of fat on some mammals. it is particularly important for species that feed and breed in different parts of the ocean. during these periods, the animals metabolize fat. blubber may save energy for marine mammals such as dolphins, in that it adds buoyancy to a dolphin while swimming. blubber differs from other forms of adipose tissue in its extra thickness, which allows it to serve as an efficient thermal insulator, making blubber essential for thermoregulation. blubber is more vascularizedârich in blood vesselsâthan other adipose tissue. blubber has advantages over fur (as in sea otters) in the respect that although fur can retain heat by holding pockets of air, the air pockets will be expelled under pressure (while diving). blubber, however, does not compress under pressure. it is effective enough that some whales can dwell in temperatures as low as .{{cite web | url= http://www.pbs.org/oceanrealm/intheschool/school
Animal_fat_products Inuit_cuisine Marine_mammals Whale_products