They chew a lot of bones of a certain kind; other bones which are just as chewably soft they do not use at all. They eat the ones that taste good. The bones not chewed by Eskimos are those of the blubber-carrying sea mammals — seal, walrus, whale, polar bear. Theoreticians will say that there you are! — that the Eskimos don't chew those bones because they are getting plenty of fat from the blubber direct.