A gander will often stand between his mate and potential threats, his head down in a defensive posture. Here a male Czech Goose shows this primitive expression of aggression and will most likely do it when leading any additions to the family too. Make way — the goslings are coming through!
Konrad Lorenz (1903–1989) studied behaviour in ducks and geese, particularly imprinting. Much of his research gave us telling observations on the human condition.