The Sumatran muntjac, about the size of a large dog, was photographed and rescued from a hunter's snare 6,400 feet (1,951 metres) high in mountains of the Kerinci-Seblat National Park. The species was originally discovered in 1914 but had not been seen since 1930, Flora & Fauna International, whose experts found the deer along with park officials, said in a statement.
Two more of the deer were later photographed elsewhere in the park.
The snared deer was photographed in 2002 but only recognised as a Sumatran muntjac this year, in a 2008 international "Red List" of endangered species, after scientists confirmed that it was a different species from the related red muntjac.
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(Editing by Angus MacSwan)