Social Dominance, Mating and Spacing Systems, Female Fecundity, and Vocal Dialects in Captive and Free-Ranging Brown-Headed Cowbirds

摘要: The expression of strong parental care is one the reasons birds attract so much attention from both laymen and biologists. Given this attention, it not surprising that few bird species exhibit little or no have become especially noteworthy. In case widespread brood-parasitic Brown-headed Cowbird (Molothrus ater), notoriety has been combined with loathing, because only does cowbird for its young but breeding activities usually result in death some all “innocent” hosts. Dawson (1923, p. 77), example, denounced female as “destitute natural affection...” “... unchaste mother a race gone wrong, an enemy society, [and] blight upon flower Progress.”