Apes and Monkeys

Primates  also flourish all over Bangladesh, but most plentifully in the Sundarbans and the Hill Tracts.
Amongst the different kind you will find the Hoolock Gibbon (the only ape in the subcontinent) as wells as langurs, and different species' of monkeys.
Hoolock gibbons mate for life and look after their territories with whistle songs that echo from side to side the forests in the early mornings, charitable rise to their handle of the "singing ape.