The bulls were seen near the Bang hot mineral spring in Le Thuy District’s Kim Thuy Commune.
One bull detetected in Kim Thuy Commune
Photographers from Vietnam Nature programme have also found them there.
Le Trong Giai, the programme director, said that there might be at least two adults and a calf are living in the area.
The bull is considered as an endangered species listed in Group 1B in Vietnam’s Red Book.
Bull hoof marks were also found at Bac Huong Hoa Nature Reserve in Quang Tri Province. Local authorities believe around three bulls are living there.
