» This article is about the body tissue. For the Judy Blume novel, see Blubber (novel):For the fictional bear called Blubber, see Wacky Races Blubber is a thick layer of vascularized fat found under the skin of all cetaceans, pinnipeds and sirenians. Description Lipid-rich blubber comprises the hypodermis and covers the whole body, except for the appendages, loosely attached to the musculature. It can comprise up to 50% of the body mass of some marine mammals Function Blubber serves several dif… (More on Blubber)