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.
Behavior Canada Geese feed by dabbling in the water or grazing in fields and large lawns. They are often seen in flight moving in pairs or flocks; flocks often assume a V formation. Habitat Just about anywhere near lakes, rivers, ponds, or other small or large bodies of water, and in yards, park lawns, and farm fields.