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nocturnal + noun
nocturnal 作定语时直接放在名词前，常用来描述动物、活动等，如 nocturnal animal（夜行性动物）、nocturnal activity（夜间活动）。
Owls are familiar nocturnal birds.
猫头鹰是人们熟悉的夜间活动的鸟类。
夜间活动的；夜行的
先理解核心含义，再看它在真实句子里的用法。
夜间活动的；夜行的
active mainly during the night
Owls are familiar nocturnal birds.
猫头鹰是人们熟悉的夜间活动的鸟类。
主要在夜间活动的
Primarily active during the night.
夜间活动的
belonging to or active during the night
夜间发生的,每夜的
Taking place at night, nightly.
夜晚的
of or relating to or occurring in the night
Owls are nocturnal hunters, relying on their keen eyesight in the dark.
猫头鹰是夜间捕食者，依靠敏锐的视力在黑暗中捕猎。
AI contextual example
My cat is nocturnal, so she sleeps all day and becomes active at night.
我的猫是夜行性的，所以它整天睡觉，夜晚活跃。
AI contextual example
We took a nocturnal walk through the forest to observe the stars.
我们在夜间穿过森林散步，以便观察星星。
AI contextual example
nocturnal animals are active at night
夜行动物在夜间活动
WordNet
nocturnal 作定语时直接放在名词前，常用来描述动物、活动等，如 nocturnal animal（夜行性动物）、nocturnal activity（夜间活动）。
Owls are familiar nocturnal birds.
猫头鹰是人们熟悉的夜间活动的鸟类。
作表语时强调主语具有夜行性这一习性；主语通常是动物，也可以是人或生物。此时含义与作定语时相同。
Many small desert animals are nocturnal.
许多沙漠小动物都是夜间活动的。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
夜间活动的动物
Owls are nocturnal animals, so they hunt at night.
猫头鹰是夜间活动的动物，所以它们在夜间捕猎。
夜间捕食者
The leopard is a solitary nocturnal predator.
豹是一种独居的夜间捕食者。
夜间活动
The forest was full of nocturnal activity.
森林里充满了夜间活动。
夜间活动的习性
Scientists are studying the nocturnal habits of bats.
科学家正在研究蝙蝠的夜间活动习性。
夜间视力
Cats have excellent nocturnal vision.
猫有极好的夜间视力。
夜间迁徙
Radar studies reveal the nocturnal migration of many birds.
雷达研究揭示了许多鸟类的夜间迁徙。
Use nocturnal naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记住：nocturnal 里有 turn——夜晚，猫头鹰转过头来活动。
语域：formal 常见场景：biology、scientific writing、formal description nocturnal 是较正式用词，多用于生物学或学术描述，表示“夜间活动的”或“夜晚的”。日常口语中较少直接使用，比较常见于书面或科普语境。
通常用于描述动物或活动，也可用于人。
Dictionary facts from ECDICT, OCTANOVE, WIKTIONARY.