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Colonel Arthur Hay, 9th Marquess of Tweeddale (9 November 1824 – 29 December 1878), known before 1862 as Lord Arthur Hay and between 1862 and 1876 as Viscount Walden, was a Scottish soldier and ornithologist. He was born at Yester, Gifford, East Lothian. He served as a soldier in India and the Crimea. He succeeded his father to the marquessate in 1876. He died at Chislehurst, and was succeeded by his brother.

Hay purchased a lieutenantcy in the Grenadier Guards[1] in 1841. He purchased a captaincy in 1846 and was promoted lieutenant-colonel without purchase in 1854 and Colonel in 1860. In 1866 he transferred to the 17th Lancers.

He was president of the Zoological Society of London from 16 January 1868.[2][3] His ornithological works were published privately in 1881 by his nephew, Captain Robert George Wardlaw-Ramsay, with a memoir by Dr W. H. Russell, and the attribution Walden is used in taxonomic listings.[4]

He had a private collection of birds,[5] insects, reptiles and mammals. He employed Carl Bock to travel to Maritime Southeast Asia and collect specimens. Tweeddale described about 40 species collected by Bock for the first time.

References[edit | edit source]

Peerage of Scotland
Preceded by
George Hay
Marquess of Tweeddale
Succeeded by
William Hay

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