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.
What Do Canadian Geese Eat. Canadian goose (Branta Canadensis) is a native bird that is endemic to the North America. Canadian Canadian geese predominantly feed on small insects, pellets and fish since they are herbivores. These types of geese also rely on vegetation, grains, and grasses for their daily feed. These species eat too many grasses while walking on land. Canadian geese also feed on wheat, beans, corn, roots, seaweeds, bugs, rice, and grains. These kinds of geese supplement their diet with aquatic plants.