Background In addition to social and cultural factors, sex differences in the central nervous
system have a critical influence on behavior, although the neurobiology underlying these …

Highlights•Contributions to different tasks are often positively correlated in helpers.•The
correlations were partially positive in the naked mole-rat.•Age-or size-based polyethisms …

Structures built by animals are extended phenotypes, and animal behavior can be better
understood by recording the temporal development of structure construction. For most …

Background In addition to social and cultural factors, sex diferences in the central nervous
system have a criti‑cal infuence on behavior, although the neurobiology underlying these …

The question of how evolution builds complex behaviors has long fascinated biologists. To
address this question from a genetic perspective, we capitalize on variation in innate …