Νυκτόβιο ζώο: Διαφορά μεταξύ των αναθεωρήσεων

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[[File:Northern Spotted Owl.USFWS-thumb.jpg|thumb|right|[[Owl]]s are well-known for being nocturnal, although some owls are active during the day.]]
'''Nocturnality''' is thean foot[[animal of a animalbehavior]] characterized by activity during the night and sleeping during the day. The opposite is [[diurnality]]. The intermediate [[crepuscular]] schedule (twilight activity) is also common. Some species are active both in daytime and at night. Living at night can be seen as a form of [[niche differentiation]], where a species' niche is partitioned not by resources but by [[time]] itself, i.e. temporal division of the [[ecological niche]]. It can also be viewed as a form of [[crypsis]], in other words an adaptation to avoid or enhance [[predation]]. There are other reasons for nocturnality as well, such as keeping out of the heat of the day. This is especially true in [[desert]]s, where many animals' nocturnal behavior prevents them from losing precious water during the hot, dry daytime. This is an [[adaptation]] that enhances [[osmoregulation]].<ref>N.A.Campbell (1996) ''Biology'' (4th edition) Benjamin Cummings NY. ISBN 0-8053-1957-3</ref>
 
Many species which are otherwise diurnal exhibit some nocturnal behaviour; for example, many [[seabird]]s and [[sea turtle]]s attend breeding sites or colonies nocturnally to reduce the risk of predation (to themselves or their offspring) but are otherwise diurnal.