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.
According to what do geese eat, the best choice would be a wheat, corn or the oats. You can also buy a lettuce or a cabbage in a local store and feed your geese with it. Sometimes they can eat cooked potatoes (ex. left from a dinner) or carrots.