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It looks a lot like a Mantled Howler monkey, but I'm not that sure! There is some Howler subspecies I don't even know about it, but what you said Yasser is totally true their howling is really amazing!
Totally, I remember first hearing their cry at night on my trip through the Amazon. They're actually very shy and being able to spot is a real privilege. Your spotting looks very similar to one I saw, except the colour is a bit different http://www.projectnoah.org/spottings/258...
These monkeys are great! They're pretty small and non-aggressive, but when it's night and you hear their howling for the first time, it sounds like it's coming from an 800 pound beast that wants to eat you, haha!
Spotted on Mar 15, 2011 Submitted on Mar 15, 2011
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