摘要 : Kleptoparasitism among passerines is rare. We report two instances of kleptopar- asitism, one with an adult Worm eating Warbler (Helmitheros vermivorus) acting as a klep- toparasite on a female Black and white Warbler (Mniotilta v... 展开 Kleptoparasitism among passerines is rare. We report two instances of kleptopar- asitism, one with an adult Worm eating Warbler (Helmitheros vermivorus) acting as a klep- toparasite on a female Black and white Warbler (Mniotilta varia) and one with a male Indigo Bunting (Passerina Cyanea) acting as a kleptoparasite on a female Worm eating Warbler. In Both instances parents were disturbed while feeding fledglings. This combination may occur Infrequently, which would explain why kleptoparasitism is rarely observed among small pas- serines. 收起