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.
Most geese are fed a mixture of corn, wheat and soybeans, although a few farmers feed their animals with vegetables including salads in California. Mature geese carcasses weigh 18 â 19 lbs. ( 8 â 9 kg) although young animals weighing 10 â 14 lbs ( 4 Â½ to 5 Â½ Kg) are more popular with housewives.