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In page Spix's macaw:

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The bird had not been studied in the wild until the 1970s. In 1974, Brazilian ornithologist Helmut Sick observed groups of three and four of the birds near Formosa do Rio Preta in northwest Bahia flying over buriti Palms (Mauritia flexuosa).[14] As recently as 1980, Robert Ridgely (ornithologist) stated that "there is no available evidence indicating a recent decline in numbers." Beginning around 1980, at the very height of the illegal bird trade, traders and trappers removed dozens of Spix's from the wild, and by the early 80s, it was generally believed to be extinct in the wild.[15] Naturalist Dr. Paul Roth conducted field surveys of the bird in the Curacá region from 1985 to 1988. Roth found only 5 birds in 1985, three in 1986, and only two after May 1987.[16]