What required significant structural remodeling in the skull to anchor walrus tusks?

The rostrum (the snout area)

The physical development of prominent tusks, which are modified canine teeth, demanded substantial anatomical reorganization within the skull structure of the Odobenid lineage. Specifically, the rostrum, or snout area, underwent significant remodeling to provide the necessary anchoring support for these large teeth. This structural investment meant changes in jaw muscle attachment points and overall skull strength were necessary to handle the forces exerted when using the tusks for display, defense, or foraging aids. This heavy, specialized structure contrasts markedly with the lighter, more generalized skull architecture of the earlier, tuskless walrus relatives.