Insect eggs can take any shape at almost any size, refuting explanations for their dimensions based on geometric scaling laws or on relationships between egg traits and adult traits.

For primates, males’ fancier ornaments are linked with smaller testes, according to a new comparative study.

Asexual female nematodes use their male offsprings’ sperm to fertilize eggs, but cast away their genes.

The extremely rare event, thought to be caused by two sperm cells fertilizing the same egg simultaneously, was last reported in 2007.

Videos reveal how a female squid fertilizes her eggs—one at a time and without spilling much stored sperm.

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

Nest predation of shorebirds that raise young in the Arctic are up threefold since the mid-20th century, and climate change may be to blame, according to a study.

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.