Cotton-top tamarins are a fun monkey to watch. They look quite playful, are actually fairly tiny, and have this wild white tuft of hair atop their heads. They are not found many places; Columbia is where they typically inhabit, and it's thought that there are only 6000 or so left in the wild. It has been observed that they exhibit a high level of cooperative care and can also show both altruistic and spiteful behaviors.
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From @mmckinneyphoto13