We have previously shown that the range of prey sizes captured by co-occurring species of group-hunting social spiders correlates positively with their level of sociality. Here, we show that this pattern is probably caused by differences among species in colony size and the extent to which individuals participate in group hunting. We assess levels of participation for each species from the frac...

Detecting dominance relationships, within and across species, provides a clear fitness advantage because this ability helps individuals assess their potential risk of injury before engaging in a competition. Previous research has demonstrated that 10- to 13-mo-old infants can represent the dominance relationship between two agents in terms of their physical size (larger agent = more dominant), ...

While recent studies confirm parental child sex preference in less developed countries, its pattern varies. Son preference is especially prevalent in Bangladesh, China, India, and Pakistan. Sex preference in sub-Saharan Africa is a neglected area of enquiry. Completed research focuses on women’s views to the neglect of men, despite the latter’s importance as primary decision-makers. This study ...