"African Elephant". Oakland Zoo. Retrieved 17 September 2023. Most African elephants are diurnal though some herds who live near human populations have become mostly nocturnal to avoid human interactions.
Swinnen, Kristijn R.R.; Hughes, Nelika K.; Leirs, Herwig (2015). "Beaver (Castor fiber) activity patterns in a predator-free landscape. What is keeping them in the dark?". Mammalian Biology. 80 (6): 477–483. doi:10.1016/j.mambio.2015.07.006. hdl:10067/1269160151162165141.
Sandhyarani, Ningthoujam. "Nocturnal Animals List". Buzzle. Archived from the original on 2012-03-15. Retrieved 2012-02-19.{{cite web}}: CS1 maint: unfit URL (link)
Clark, R. J. and Mikkola, H. (1989) A preliminary revision of threatened and near-threatened nocturnal birds of prey of the world. Pp. 371-388 in Meyburg, B.-U. and Chancellor, R.D., eds. Raptors in the modern world. Berlin and London: World Working Group on Birds of Prey and Owls.