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.
The average goose can eat up to 5 pounds of grass in a single day. This amount of feces can result in unsightly grass areas. The average goose also produces about 1.5 pounds of fecal matter per day. This quickly adds up, leading to more unsightly and hard to clean areas.