A very rare species of small, deer-like animal thought to be on the verge of extinction has been spotted in the northwestern jungle of Vietnam for the first time in nearly 30 years. Known as the Silver-backed Chevrotain or Mouse deer, a specimen was last recorded in 1990, according to a study published Monday in the journal Nature Ecology and Evolution. The species, Tragulus versicolor, was first described in 1910 based on several animals found near Nha Trang, about 450 kilometres (280 miles) northeast of Ho Chi Minh City.