nocturnality
/ˌnɒktɜːˈnælətɪ/Nocturnality is a behavior in some non-human animals characterized by being active during the night and sleeping during the day.
noun [具体名词] 夜间活动性；夜间活动的习惯
Other ways an organism may be cryptic include nocturnality, subterranean lifestyle, and transparency. 生物具有的其他隐蔽能力包括夜间活动、地下活动以及透明物态。
