The newcomers bring to five the number of yellow-cheeked gibbons taken to the center in less than a month, Chuong said.
The other two were found at the District 6 house of one Huynh Van Nam, who handed over the gibbons without fuss after denying any knowledge of a ban on keeping protected wildlife.
One of the two has since died, though why is not yet known.
The yellow-cheeked gibbon (Nomascus gabriellae) was classified as in danger of extinction by the International Union for the Conservation of Nature and Natural Resources in 2000.
A report by the Wildlife Conservation Society last year counted 2,500 yellow-cheeked crested gibbons in Cambodiaâs Seima Biodiversity Conservation Area, an estimate that represents the largest known population of the species in the world.
Source: Tuoi Tre