Brown spider monkeys have long, lanky arms and a long, powerful tail. The tail is used as a fifth limb, helping the monkeys to grip branches and swing gracefully from tree to tree.
They are sociable primates spending time in groups. In the wild this tends to be between three and five, but can reach up to 100 in the same locality.
The brown spider monkey is classified as Critically Endangered and considered to be one of the top 25 most endangered primates in the world. There are thought to be less than 3,000 left in the wild, due to their forest habitat being destroyed for cattle ranching, illegal mining and oil palm.
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