Jisho

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やこうせい 夜行性
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Noun, Noun which may take the genitive case particle 'no'
1. nocturnality; nocturnal habits​
Wikipedia definition
2. Nocturnality​Nocturnality is an animal behavior characterized by activity during the night and sleeping during the day. The common adjective is "nocturnal". Nocturnal creatures generally have highly developed senses of hearing and smell, and specially adapted eyesight. Some animals, such as cats and ferrets, have eyes that can adapt to both low-level and bright day levels of illumination. Others, e.g. bushbabies and (some) bats, can function only at night.
Read “Nocturnality” on English Wikipedia
Read “夜行性” on Japanese Wikipedia
Read “Nocturnality” on DBpedia

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