This animation series shows four experiments that compare the activity patterns of a wild-type fly keeping a normal schedule with those of a mutant fly apparently following a 19-hour internal clock.
The bobtail squid swims during the night to hunt. During the day, it burrows to hide from predators.
This time-lapse videoclip shows human circadian activity while assembling a T. rex skeleton.
This time-lapse videoclip illustrates a mouse's nocturnal behavior.
Four lectures highlight the research of two scientists who have made groundbreaking discoveries elucidating the molecular basis of circadian clocks—the internal timekeepers that govern fluctuations in behavior and physiology on a 24-hour cycle.
Dr. Joseph Takahashi takes us on an exciting journey into a very special region of the brain—the biological clock that governs our physiology and certain behaviors.
Although tiny in size, the fruit fly has had a major impact on our understanding of circadian rhythms.
This survey, developed by Horne and Ostberg, will let you determine if you are a morning or an evening person.