Save the Rhino International (SRI), a UK-based conservation charity, is Europe's largest single-species rhino charity, in terms of funds raised and grants made, and in terms of profile and positioning. It began fundraising for in situ rhino conservation projects in 1992 and was formally registered as a charity (number 1035072) in 1994. One of SRI's founder patrons was the British writer and humorist Douglas Adams, who also was known to be a conservation movement enthusiast.