He was president of the Zoological Society of London. 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.
He had a large private collection of birds, insects, reptiles and mammals. He employed Carl Bock to travel to the Malay archipelago and collect specimens. Tweeddale described about 40 species collected by Bock for the first time.
Marquess of Tweeddale is a title of the Peerage of Scotland, created in 1694 for the 2nd Earl of Tweeddale.
Lord Tweeddale holds the subsidiary titles of Earl of Tweeddale (created 1646), Earl of Gifford (1694), Viscount of Walden (1694), Lord Hay of Yester (1488), and Baron Tweeddale, of Yester in the County of Haddington (1881), all but the last in the Peerage of Scotland.
As Baron Tweeddale in the Peerage of the United Kingdom, Lord Tweeddale sat between 1881 and 1963 in the House of Lords.
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