Reproductive biology

Generally polygynous. Single births are typical, although twins are born very occasionally, and two teats (mammae) are consistently present in the chest region. All species have a

A mantled guereza (Colobus guereza) troop in Kenya. (Photo by Norman Owen Tomalin. Bruce Coleman, Inc. Reproduced by permission.)

Trachypithecus johnii), and six are Near Threatened (Colobus polykomos, Presbytis femoralis, Presbytis melalophos, Presbytis thomasi, Procolobus verus and Semnopithecus entellus). Five species are listed as Data Deficient (Presbytis fredericae, Presbytis frontata, Presbytis hosei, Trachypithecus laotum, and Trachypithecus villosus).

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