Hieroglyphics of Horapollo, tr. Alexander Turner Cory, , at sacred-texts.com
When they would denote a son, they delineate a CHENALOPEX (a species of goose). For this animal is excessively fond of its offspring, and if ever it is pursued so as to be in danger of being taken with its young, both the father and mother voluntarily give themselves up to the pursuers, that
their offspring may be saved; and for this reason the Egyptians have thought fit to consecrate this animal.