 Female dispersal is not seen only in birds; males may remain philopatric in mammals when the average adult male residency in a breeding group exceeds the average age for female maturation and conception.For example, in a community of chimpanzees in Gombe National Park, males tend to remain in their natal community for the duration of their lives, while females typically move to other communities as soon as they reach maturity.Male dispersal is more common in mammals with cooperative breeding and polygynous systems.