Offspring sometimes maintain a bond with the mother throughout life , which may last up to 50 years in the wild (see Bonobo , 2004 . III . Social Behavior Chimpanzees form loosely organized bands of from 2 up to 80 individuals on fairly large home ranges , where the animals remain for years . Within a band , smaller groups may form , break up , and reform sometimes a female migrates to another band . Males never migrate . Except between mother and young , little permanency exists in individual...











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