![]() Saper CB, Lu J, Chou TC, Gooley J (2005) The hypothalamic integrator for circadian rhythms. PhD thesis, Michigan State University, East Lansing, MIįuller PM, Gooley JJ, Saper CB (2006) Neurobiology of the sleep-wake cycle: sleep architecture, circadian regulation, and regulatory feedback. Mahoney M (2003) Sex, surges and circadian rhythms: The timing of reproductive events in a diurnal rodent. Some animals are crepuscular, meaning they are active at dawn and dusk. PhD thesis, Michigan State University, East Lansing, MI ![]() Schwartz MD (2006) Neural substrates of diurnality in the Nile grass rat, Arvicanthis niloticus. Domestic cats (Felis catus) are considered to be crepuscular because they’re most active during the hours of dawn and dusk (AKA low light hours). Other animals are crepuscular, active at dawn and dusk. ![]() Ancient rocks that date back to 2.5 billion years old have been discovered in the Clark Mountains. Crepuscular animals are those that are active primarily during twilight (that is, the periods of dawn and dusk). By being active at night, wolves avoid contact with humans and other predators who hunt more actively during the day. Each of these lifestyles has its own advantages. Wolves usually show nocturnal behavior as there is generally less activity at night. While most moths are nocturnal (active at night), others are diurnal (active during the day) or crepuscular (active at twilight). Smale L, Lee TM, Nunez AA (2003) Mammalian diurnality: Some facts and gaps. Mountain ranges, dry river beds, great mesas, towering sand dunes, striking cinders cones, domes and lava flows define Mojave. Moths make up the third most diverse insect group in New Zealand, and their day/night habits are also diverse. Klein D, Moore RY, Reppert SM (1991) Suprachiasmatic Nucleus: the mind's clock. There are lots of recipes for moth sugar available online, but the critical ingredients are. Crepuscular animals are active at twilight (i.e. ![]() Stephan FK (2002) The “other” circadian system: food as a zeitgeber, J Biol Rhythms 17:284–292 Most of our 800 species of larger moths are strictly nocturnal, but they are drawn to light and sugar. Diurnal animals are animals that are active during the day. In: Knobil E, Neill JD (eds) The physiology of reproduction, Raven Press, New York, pp 487–540 Turrek FW, van Cauter E (1994) Rhythms in reproduction. Moore-Ede M, Sulzman F, Fuller C (1983) The clocks that time us. ![]()
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