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As a recently started article with no body outside of the overview section, this article has a lot of room to expand! A few sections should eventually be added, including evolutionary history/taxonomic classification, anatomy/physiology, ecology, behavior, major threats, and conservation. The paragraphs written so far discuss background ecological, taxonomical, and physiological information. Additionally, there is some mention that emperor tamarin live together in social groups. This is a solid start, but an overarching behavior section could be added that includes sub-sections of diet, social structures, reproduction and breeding, and communication. Specifically, group behavior of 2-8 animals with a leading oldest female could be expanded on. For example, altruism in the group may be present if other females reside in the group but are non-breeding. Additionally, there may only be a couple mature male breeders in the group, which can also add to a cooperative breeding conversation. Stretching the behavior section could also include behavior involved in kin recognition and discrimination. The white mustache in the species may play a role here as a “greenbeard” trait, and also in sexual selection. The mention of mixed species association between emperor tamarins and brown-mantled tamarins should also be explicated for the altruism and/or spite that may be involved. Finally, the use of crying to denote interlopers can mention alarm calls and why this may is ecologically significant for the species. This discussion could involve relatedness, if alarm calls are given for groups that are more genetically related, or whether there is an effect of learned kinship between the species. Nsavalia23 4:47, 21 September 2012 (UTC)