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In one-male group species, extra males typically reside in all-male “bachelor” groups. These are Han
Bonobo females form close alliances, maintained through sex, but these alliances are lacking in chim
Although males tend to be larger than females, the two overlap significantly in size. The size of a
Functional MRI Scans These scans of human brains show localized average increases in neural activity
Young adults increase in self-esteem between the ages of 18 and 25, according to this longitudinal s
Suicide rates in Canada are more than three times higher for males than for females