The hybrids from the common and Chinese geese (A. cygnoides), species which are so different that they are generally ranked in distinct genera, have often bred in this country with either pure parent, and in one single instance they have bred inter se.
Antzar arruntaren eta txinarraren (A. cygnoides) hibridoak-genero ezberdin bitan sailkatzen diren espezie erabat ezberdinak berauek-sarri umatu dira herrialde honetan guraso-espezie garbietako bat edo bestearekin, eta kasu bakar batean inter se ere umatu dira.