Gerald Edwin Hamilton Barrett-Hamilton

Major Gerald Edwin Hamilton Barrett-Hamilton (1871–1914) was a notable British/Irish natural historian, co-author with M. A. C. Hinton of A History of British Mammals, which remained "the most thorough, accurate and scientific publication" on British mammals until the 1950s.

Barrett-Hamilton was born in India of Irish parents, who returned and settled at Kilmanock in County Wexford when the boy was three years old. He was educated at Harrow and Trinity College, Cambridge, spending summer holidays botanizing at home under the encouragement of A. G. More. He held a commission in the 5th (Militia) Battalion of the Royal Irish Rifles, where he was appointed captain on 3 March 1897. Following the outbreak of the Second Boer War, he was appointed Instructor of Musketry on 28 February 1900, and saw active service in South Africa 1901-1902. He later worked in the Natural History Museum, London, and worked on various Government investigations. He married Maud Charlotte Eland, of Ravenshill, Transvaal. They had six children.

In his work as a natural historian, he described a great number of new species of small mammal on the islands around the British Isles, notably the house mice and field mice of St. Kilda which he called Mus muralis and Mus hirtensis, believing that these had evolved in situ having colonised the islands naturally via land or ice-bridges. Although this has been demonstrated to be wrong, and many of his described species are now regarded as island forms rather than species in their own right, his contribution to natural history was enormous. He was a valued contributor to the Irish Naturalist journal. His papers and correspondence are held at the University of Manitoba.

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