Indeed. Of the five langurs exported to Singapore Zoo, four were young males, who could have potentially lived in the region for a further two decades, ensuring ample time to import some more females:
1.0
Bobo (Unknown)
1.0
Nangua (2015)
1.0
Jing (2017)
1.0
Minh (2018)
1.0
Didi (2018)
Taronga’s troop seems to have stagnated. Following the export of the above males, unrelated pairings were as follows:
Ngai could have bred with Meili and Elke
Manchu could have bred with Noel and Elke
Neither Ngai or Manchu could have bred with Embe
Note: There’s been uncertainty whether all four of these females are still alive as reported by
@WhistlingKite24 in February this year, where it was confirmed Noel and Embe were still alive.