Cover description: Examples of red colobus from west, central, and east Africa. From left to right, top: P. badius badius in Côte d'Ivoire (W. Scott McGraw), P. pennantii on Bioko Island, Equatorial Guinea (Richard Bergl); and bottom: P. tephrosceles in Uganda (Thomas Struhsaker), and P. kirkii on Unguja Island, Zanzibar (Thomas Struhsaker), Tanzania.

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封面描述：来自西非、中非和东非的红疣猴示例。从左到右，上：科特迪瓦的 P. badius badius (W. Scott McGraw)、赤道几内亚比奥科岛的 P. pennantii (Richard Bergl)；底部：乌干达的 P. tephrosceles (Thomas Struhsaker) 和坦桑尼亚桑给巴尔安古贾岛的 P. kirkii (Thomas Struhsaker)。