Am not certain whether this is a Schmidt's Guenon (Cercopithecus ascanius) or a White-Throated Guenon (Cercopithecus erythrogaster) or some other species of Cercopithecus. Can someone identify it? This is an old photo from my visit to this zoo in 2005. As I didn't have a good camera or the 'right' experience in photography back then, the quality may be somewhat less than that of other more recent pictures I've taken
;)
