Colobinae's a subfamily of the Old World monkey family that includes 58 species in 10 genera, including the skunk-like black-and-white colobus, the large-nosed Proboscis Monkey, and the gray langurs, sacred to India. Some classifications split the colobine monkeys into two tribes, while others split them into three groups. Both classifications put the two African genera Colobus and Piliocolobus in one group; the two genera are distinct in that they've a stub thumb. The various Asian genera are… (More on Colobinae)