21 Massively Adorable Primates Sucking On Their Thumbs

I don't know about you guys, but this is kind of the cutest. Cuter than any babies doing this, at least.

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Via cuteoverload.com

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Via furrytalk.com

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Via weirdfunnyphotos.blogspot.com

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Via flickeflu.com

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Via justsayaww.blogspot.com

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Via allposters.com

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Via popularscreensavers.com

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Via banyanman.blogspot.com

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Via metro.co.uk

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Via cuteoverload.com

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Via petownertalk.com

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Via craized.com

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Via s301.photobucket.com

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Via cutestpaw.com

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Via blog.travelpod.com

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Via picturedis.tumblr.com

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Via theglobalvagabond.com

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Via marlataviano.com

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Via toptenz.net

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Via psycnet.apa.org

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Via trekearth.com