Since the last edition of this definitive textbook was published in 2013, much has happened
in the field of animal behavior. In this fourth edition, Lee Alan Dugatkin draws on cutting …

Sexual selection has resulted in some of the most captivating features of insects, including
flashy colors, bizarre structures, and complex pheromones. These features evolve in …

Obligate eusociality with distinct caste phenotypes has evolved from strictly monogamous
sub-social ancestors in ants, some bees, some wasps and some termites. This implies that …

What are the causes of natural selection? Over 40 years ago, Van Valen proposed the Red
Queen hypothesis, which emphasized the primacy of biotic conflict over abiotic forces in …

It is well known that women live longer than men. This gap is observed in most human
populations and can even reach 10–15 years. In addition, most of the known super …

The past half century has seen the development of the field of post-ejaculatory sexual
selection, the sequel to sexual selection for mate-acquisition (pre-ejaculatory) described by …

Sperm experience intense and varied selection that dramatically impacts the evolution of
sperm quality. Selection acts to ensure that sperm are fertilization-competent and able to …

Interactions between sperm and the female reproductive tract (FRT) are critical to
reproductive success and yet are poorly understood. Because sperm complete their …

Despite a staggering body of research demonstrating sex differences in expressed emotion,
very few theoretical models (evolutionary or non-evolutionary) offer a critical examination of …

Many of the colour displays of animals are proposed to have evolved in response to female
mate choice for honest signals of quality, but such honest signalling requires mechanisms to …