A 37-year-old simiang gibbon on birth control unexpectedly gave birth at the San Diego Zoo.

A University of Georgia fisheries researcher, who is head of the school’s program to farm-raise sturgeon and sell their salt-cured eggs, is expected to retire this week.

Researchers believe the genetic locus affects the regulation of another gene involved in sexual function.

For flycatchers, the attractiveness of male birds is tied to the length of their sperm.

The UK-based organization encourages public debate about the issue but does not recommend immediate policy change.

A small study based on circulating RNA in the blood of moms-to-be describes a technique that could be used to help predict who’s most at risk of preterm labor.

Bigger, older mothers produce disproportionately more eggs than their smaller counterparts do.

Cuckoo catfish trick cichlids into caring for their eggs in a strategy known as brood parasitism.

The reproductive biologist uncovered hormones important for fertility cycles.