In most mammals, males disperse to a new group after reaching sexual maturity. Dispersal often entails costs and is risky. New results from spotted hyenas show that males from the same birth group—and particularly twin brothers—very often disperse together and choose the same group to breed. The coordination is likely the combined result of males having similar preferences when they have a similar social and genetic background, and of related males actively sticking together to support one another.
Click here for original story, Twin brother spotted hyenas are often attracted to the same new group when they disperse from their birth group
Source: Phys.org