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.
They will also eat leftover vegetables like cooked potatoes, carrots, parsnips etc although not all geese like the same things and usually have to get a taste for things. Generally, it is best to provide a little food for geese to take should they want it for breakfast or before bed.