Chiropotes utahickae
The only one in Europe (certainly on public display). One of the rare species named after a zoo person - Uta Hick was director of Cologne Zoo. This single female (the Saki, not Ms Hick!) was originally one of a pair from a confiscated import. The male did not survive long but the female is still going strong. At the time of our visit it was temporarily being housed alone as the Golden-headed Lion Tamarins had suddenly taken exception to it - after a week or two to recuperate it is planned to mix her with the Geoffroy's Marmosets.