John James Audubon
Death

Audubon made some excursions out West where he hoped to record Western species he had missed, but his health began to fail. In 1848, he manifested signs of senility or possibly dementia from what is now called Alzheimer's disease, his "noble mind in ruins". He died at his family home in northern Manhattan on January 27, 1851. Audubon is buried in the graveyard at the Church of the Intercession in the Trinity Church Cemetery and Mausoleum at 155th Street and Broadway in Manhattan, near his home. An imposing monument in his honor was erected at the cemetery, which is now recognized as part of the Heritage Rose District of NYC.

Audubon's final work dealt with mammals; he prepared The Viviparous Quadrupeds of North America (1845–1849) in collaboration with his good friend Rev. John Bachman of Charleston, South Carolina, who supplied much of the scientific text. His son, John Woodhouse Audubon, drew most of the plates. The work was completed by Audubon's sons, and the second volume was published posthumously in 1851.
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