Henry Henshaw studied at Cambridge High School where he met William Brewster. In 1869 he was forced to give up school due to ill health, and went on a collecting trip to Louisiana. This marked the start of his career as a field naturalist.
In 1870 Henshaw traveled to Florida. In the same year he found the first Baird's Sandpiper east of the Mississippi River, in Boston. It was through discovery that Henshaw became known to the Secretary of the Smithsonian Spencer Baird. In 1872 he went to Utah as natural history collector on the Wheeler Expedition, continuing until it merged with the United States Geological Survey in 1879.
In 1872 Henshaw went to Salt Lake City on the Wheeler Expedition, as a naturalist, and in 1874 had his most successful field expedition, going from Santa Fe, New Mexico to Gila River and south-western Arizona. There he met with the native Apaches, and caught natural specimens for the Smithsonian. In 1875 he returned to Washington, and was approached by John Wesley Powell of the Bureau of Ethnology. Along with C. Hart Merriam and Grove Karl Gilbert, Henshaw set out West on the United States Geological Survey, where in addition to his ornithological work, Henshaw worked on linguistics and anthropology, eventually compiling two volume book titled Handbook of North American Indians North of Mexico.
In 1894, in ill health, Henshaw moved to Hawaii with the express intent of becoming a citizen of the island nation. There, he picked up photography. As his health returned, he returned to ornithology, especially around birds of Mauna Kea. Viewing the mass extinction of birds in Hawaii made Henshaw a conservationist.
In 1910 Henshaw replaced his old friend C. Hart Merriam as the head of the U.S. Biological Survey. With new-found zeal, Henshaw began working for bird conservation, publishing Fifty Common Birds of Farm and Orchard, which sold 200,000 copies, in 1913. This publication caused Henshaw to be approached by Gilbert Grosvenor, who asked Henshaw if Fifty Common Birds of Farm and Orchard could be printed in the National Geographic Magazine. The end result of that publication was the National Geographic Field Guide to Birds of North America. While not working with the National Geographic, Henshaw lobbied, along with George Shiras, to pass the Weeks-McLean Act, otherwise known as the Migratory Bird Law. Henshaw handed Woodrow Wilson the pen with which Wilson signed the act into law in 1913.
- Edward William Nelson (1932). "Henry Wetherbee Henshaw—Naturalist". Auk 49 (4): 399–427. doi:10.2307/4076404. JSTOR 4076404.
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