“Birds of a feather flock together,” or rather “opposites attract”? A recently published study on male macaques in Thailand speaks for the former: Behavioral biologists from the German Primate Centre—Leibniz Institute for Primate Research and psychologists from the University of Göttingen have observed that the more similar male Assamese macaques are in their personality, the closer they get and the stronger their social bonds.
Click here for original story, Behavioral scientists test biological principle on free-living Assamese macaques
Source: Phys.org