In the Western Hemisphere, W.H. Hudson is known primarily for his contributions to the ornithology of Argentina. Born there in 1841 to an English father and an American mother who were trying to make a living for themselves and their 6 children as ranchers in the Pampas, he grew up with few books and a passionate interest in the natural world that he was free to explore. As a young man, he sent specimens to the Smithsonian Institution and the Zoological Society of London, and published papers on local avifauna in the Society’s Proceedings. Two species he discovered, a canastero and a flycatcher, were described from his specimens by Philip Lutley Sclater of the Zoological Society and named for him. Hudson’s careful field observations made him the first to recognize that the Screaming Cowbird is an exclusive brood parasite of the Bay-winged Cowbird, an impressive feat since their eggs...

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