Prolemur simus is the largest of the bamboo lemurs (5). A dense olive-brown coat covers the rounded body, whilst the underparts and tail are grey-brown in colour with a russet tinge (3). As well as its large size, the greater bamboo lemur can be recognised by the prominent pale grey or white ear tufts (3). However, a recently discovered population of this species has a strikingly different deep golden-red coat, and no ear tufts (3). The blunt muzzles of bamboo lemurs give their faces a more rounded appearance than other members of the family. They have relatively long tails and long back legs for leaping vertically amongst the trees of their forest habitat (3).