National Geographic states..

--quote--
Indigenous peoples often hunt spider monkeys for food, and the animals are usually agitated by human contact. Logging and deforestation continue to shrink the space that spider monkeys are able to call home.
--/quote--
http://animals.nationalgeographic.com/animals/mammals/spider-monkey.html

Some other sources cite the same reasons, like the WWF

For entertaining learning, these high school kids posted a video of themselves documenting the endangered spider monkey, looks like a school project, loaded with info nonetheless

http://www.youtube.com/watch?v=4PBo_3Y-ldo
Source(s):
http://www.worldwildlife.org/species/finder/blackspidermonkey/blackspidermo...


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