High Quality Content by WIKIPEDIA articles! Blubber is a thick layer of vascularized fat found under the skin of all cetaceans, pinnipeds and sirenians. 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 a couple of inches thick in dolphins and smaller whales, to more than a foot thick in some bigger whales, such as Right and Bowhead Whales. However, this is not indictive of larger whales' ability to retain heat better, as the thickness of a whale's blubber does not significantly affect heat loss. More indictive 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.

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