▪ Abstract Extra-pair paternity (EPP) is extremely variable among species of birds, both in its
frequency and in the behavioral events that produce it. A flood of field studies and …

Intuition suggests, to most people, that parents should be selected to care for their offspring
in relation to how certain they are of being the parents of those offspring. Theoretical models …

Kinship ties-the close relationships found within the family-have been a central focus of
evolutionary biological analyses of social behavior ever since biologist William Hamilton …

Female ornaments are expected to evolve through sexual selection when male parental
investment is high. Blue-footed boobies are socially monogamous seabirds with a long …

From the parental perspective, each individual's overall reproductive effort is a combination
of mating effort and parental effort or investment. There are numerous factors that can have …

At first glance, the relationship between parent and offspring seems to begin in perfect
harmony. In particular, the image of human parents' devotion to their infant is one that has …

Highlights•Parents might face differential risks of offspring confusion.•We asked how these
differences influence offspring discrimination strategies.•We investigated tadpole transport …

Determining how individuals adjust their behaviour to maximize reproductive opportunities
is fundamental to understanding the adaptive significance of behavioural variations. Such …

Sexual segregation in foraging occurs in some species and populations of boobies
(Sulidae), but it is not a general pattern. Sexual segregation in foraging may occur to avoid …

Individual body condition is frequently used to explain differences in foraging and breeding
ecology in seabirds. However, little is known about the covariations of body mass with the …