Volume four of The Life of Mammals by David Attenborough teaches much about the many varieties of monkeys. The social climber pictured above lives to 30 years, weighs from 5 to 12 lbs and dwells within a society with a clear hierarchy of dominance. They live in the lowlands and semi-deciduous forests of Sri Lanka. For food, they prefer fruit, nuts, seeds, flowers and invertebrates. The lucky male gets from two to three females. The gestation period for a baby is only 165 days and they weigh no more than a pound. Their main predator is dogs, which are abundant. In contrast, the Macaques are in a 'vulnerable' place as classfied by the 2000 IUCN Red List regarding species survival.