Xen- (prefix): Foreign or other. As in: 1  Xenoantigen -- An antigen that is found in more than one species.  Xenograft -- A surgical graft of tissue from one species to an unlike species, genus or family.
Diet. Snow Geese feed almost exclusively on plant material. During the breeding season, they eat many seeds, leaves, and roots of aquatic vegetation. The very young birds feed on invertebrates. Berries become more important in the fall. In winter, waste grain from agricultural fields has become a primary food source.
Snow geese nest in the arctic region, along the northern tips of Canada, Alaska and Greenland. Scientists do not yet fully understand how snow geese are able to routinely find their nesting grounds in the barren arctic tundra but it has been observed that the birds return to the same area where they hatched.