An annual survey counted 382 tamaraws in a protected mountain area this year, an increase from 345 in 2013, according to data from the World Wildlife Fund (WWF).
The tamaraw, famed for its distinct v-shaped horns, can be found only in the mountains of Mindoro, a farming island in the central Philippines.
The stocky tamaraw, with its chocolate brown coat, runs wild in the forest and weighs half as much as the more common carabao, which is used by farmers in the Philippines to plough rice fields.
"If they are not protected, the species might get wiped out in five years," he said.
More From This Section
The tamaraw is considered "critically endangered" - two steps away from extinction - by the International Union for Conservation of Nature.
Hunting and the destruction of their habitat to make way for grazing areas for cattle led to their near decimation, as the population fell from 10,000 in the 1900s to just 154 by 2000, according to the WWF.
This requires ramping up forest patrols to ward off poachers and installing hidden cameras in the mountains to better understand the behaviour of the beast, Yann said.
A team of 30 forest rangers patrol a 37-acre portion of a mountain that is considered the buffalo's "core habitat", Boyles said.
"They are hunted down for food and trophy. When a species is rare, their price in the black market also goes up," he said.
"People also have this misconception that the flesh of wild animals taste better than farmed ones," he said.