The Proboscis monkey is native to Borneo. (Malaysia Traveller pic)

Sandakan is home to the Labuk Bay Proboscis Monkey Sanctuary.

Proboscis monkeys are native to Borneo. They were once widespread in the mangrove forests along the coast and on river banks of this massive island but due to rampant deforestation and destruction of their natural habitat they are now highly endangered with only a few thousand left in the wild.