The incubation patch of the house sparrow, Passer domesticus Linnaeus.
D000818:Animals; D001717:Birds; D004958:Estradiol / Q000494:pharmacology*; D005241:Feathers; D005260:Female; D009929:Organ Size; D011374:Progesterone / Q000494:pharmacology*; D011388:Prolactin / Q000494:pharmacology*; D012867:Skin / Q000254:growth & development*
D011374:Progesterone; D004958:Estradiol; D011388:Prolactin