More than a century ago, William Morton Wheeler proposed that social insect colonies can
be regarded as superorganisms when they have morphologically differentiated reproductive …

From an evolutionary perspective, social behaviours are those which have fitness
consequences for both the individual that performs the behaviour, and another individual …

Living things are organized in a hierarchy of levels. Genes group together in cells, cells
group together in organisms, and organisms group together in societies. Even different …

The aim of this review is to consider the potential benefits that females may gain from mating
more than once in a single reproductive cycle. The relationship between non-genetic and …

One hundred years after Darwin considered how sexual selection shapes the behavioral
and morphological characteristics of males for acquiring mates, Parker realized that sexual …

Bumblebees are familiar and charismatic insects, occurring throughout much of the world.
They are increasingly being used as a model organism for studying a wide range of …

This is a masterly theoretical treatment of one of the central problems in evolutionary
biology, the evolution of social cooperation and conflict. Steven Frank tackles the problem …

Recent decades have witnessed an explosion of theoretical and empirical studies of sex
allocation, transforming how we understand the allocation of resources to male and female …

All evidence currently available indicates that obligatory sterile eusocial castes only arose
via the association of lifetime monogamous parents and offspring. This is consistent with …

Social insects so dominate many terrestrial habitats (Wilson 1990) that they can hardly
escape the attention of biologists, but even if they were rare, they would still attract special …