We analysed the copulation calling behaviour of wild female chimpanzees (Pan troglodytes schweinfurthii) at Budongo Forest, Uganda, but found no support for the male-male competition hypothesis.

• 激素研究表明，雌性嚎春活动与它们的经期和孕期无关。但是，在和高级别的雄性交配时它们表现得更活跃，而当高级别雌性在一旁时，其活跃程度明显降低。