Artist's impression of the Purbeck lagoon at dusk: Durlstotherium (right and center foreground) and Durlstodon (left foreground) ventured out at night to hunt insects. The theropod Nuthetes holding a captured Durlstotherium (centre middle distance).The tapetum lucidum of a European badger reflects the photographer's flash, one of many nocturnal traits ubiquitous in mammals
The nocturnal bottleneck hypothesis is a hypothesis to explain several mammalian traits. In 1942, Gordon Lynn Walls described this concept which states that placental mammals were mainly or even exclusively nocturnal through most of their evolutionary history, from their origin 225 million years ago to after the Cretaceous–Paleogene extinction event, 66 million years ago.[1] While some mammal groups later adapted to diurnal (daytime) lifestyles to fill newly unoccupied niches, the approximately 160 million years spent as nocturnal animals has left a lasting legacy on basal mammalian anatomy and physiology, and most mammals are still nocturnal.[2]
^Gerkema MP, Davies WI, Foster RG, Menaker M, Hut RA. The nocturnal bottleneck and the evolution of activity patterns in mammals. Proc Biol Sci. 2013 Jul 3;280(1765):20130508. doi: 10.1098/rspb.2013.0508
^Sinn, J. "New Study Shows Effects of Prehistoric Nocturnal Life on Mammalian Vision". University of Texas. Retrieved 24 November 2014.
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