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.
Canada geese are usually found in open, grassy habitats. These birds usually avoid areas with tall grass and shrubs because it can hide predators. This species prefers to live near water including ponds, marshes, rivers, or coastlines.n captivity, the longest lived goose was 80 years old. In the wild, the oldest goose was reportedly 30 years and 4 months old. This is an extraordinary lifespan for a wild bird; the life expectancy for most wild geese is 12 years.