A group of the precious dolphin species Irrawaddy has been spotted at Kien Giang biosphere reserve in southern Vietnam.
The group of around 20 dolphins were found around the Ba Lua islands, completely separated from other Irrawady groups at Thailand's coastal lake Songkhla and in the Mekong River upstream, news website VietNamNet said Friday.
Experts at the Vietnam Institute of Tropical Biology said the latest group is big compared to previous ones, with between seven to 10 dolphins.
Irrawaddy, known scientifically as Orcaella brevirotis, is ranked by the International Union for Conservation of Nature as a vulnerable species.
There's little information in Vietnam about the status or distribution of the dolphin.