University of Michigan researchers scope out primates to figure out human behavior. If only human males had a Hyper-Color chest patch...
"Unique among primates, gelada males have a patch of bare skin on their chest that changes in color according to status. Beehner believes that this relationship (between color and status) might be linked by testosterone. As testosterone levels rise, male chests change from pale pink to bright red. Simply put, this chest patch could be a signal to other males, a way for males to decide whether they want to pick a fight with a high-testosterone rival or not."
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