Meta-analysis reveals there is no evidence that variation in clutch size in birds is driven by the reproduction–survival trade-off.

The adaptive value of social behaviour exhibited in adult life varies with conditions experienced in early life, and poorer conditions may promote conflict over cooperation.

Experimental manipulations of social groups of ostriches show that the benefits of cooperative parental care for females, and the costs of sexual competition for males, lead to sex differences in optimal group sizes.

Honey bee queens adjust the provisioning of their eggs based on their perception of colony size via upregulation of metabolism, protein transport, and cytoskeletal reorganization, including the small GTPase Rho1.

After insemination, honeybee queens experience a rapid reduction in vision and flight performance, consistent with an ongoing sexual conflict over the number of mating flights that queens embark on.

Maternally experienced environmental stress leads to multigenerational inheritance of ethanol preference and an altered rewards pathway in Drosophila melanogaster.

Temperature, the presence of an enemy species and the density of the mutualistic partner species interact to determine the expression of a protective mutualism.

The genetic and behavioral diversity of the zebra finch, both in the wild and in captivity, make it well-suited for neuroethological studies of vocal learning, culture, and social bonding.

Upon detecting a fatal infection using chemical cues, ants puncture the cuticle of sick brood and inject antimicrobial poison that disrupts the pathogen's life cycle and prevents it from reproducing, thus protecting the colony from disease.

Lifelong continuous reproduction, late-life investment into female sexuals, a short phase of senescence, and reproductive death characterize the life history of Cardiocondyla obscurior ant queens.