Fig. 1From: Egg rejection and egg recognition mechanisms in Oriental Reed WarblersComparison of male and female individuals of Oriental Reed Warblers. a refers to a female incubating in the nest; b refers to a female rejecting a blue model egg; c refers to a male checking the nest and d refers to a female incubating and a male checking the nest. Yellow arrows show the top of the head of both sexes, with the female being flat and the male having a crestBack to article page