Staring pale-yellow eyes set off by red orbital ring ... White uppertail coverts with sparse dark bars. Tail variable: base whitish (bleaching to white); broad blackish distal band; often dark ...

in the case of the gray and yellow-tailed monkeys, they also have large, dark eyes and expressive faces. Woolly monkeys have long, strong prehensile tails with a thick pad on the end that helps ...