A study links having a male twin with women’s educational, financial, and childbearing decisions. Researchers suspect prenatal exposure to testosterone may play a role.
Hermit crabs living in broken shells outperform those inhabiting intact shells in fights because they attack more aggressively, compensating for lower muscle strength with vigor.
Automating Drosophila behavior screens gives researchers a break from tedious observation, and enables higher-throughput, more-quantitative experiments than ever before.
Reef fish, once thought to be unable to see red wavelengths, not only fluoresce deep red, but males of some species react to seeing their own bioluminescent pattern.
In Chapter 3, “Tamping the Simian Urge,” author Travis Rayne Pickering contrasts the brute physicality of predatory chimpanzees with the headier hunting style employed by humans.
Adolescent rats exposed to stress grow into pathologically aggressive adults, behaviors that may be explained by accompanying epigenetic changes and altered brain activity.
