Nocturnal
야행성
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<speciesfyi-glossary slug="nocturnal"></speciesfyi-glossary>Definition
Describing animals that are primarily active during nighttime and rest during daylight hours.
Detailed Explanation
Nocturnality provides multiple advantages: cooler temperatures reduce water loss in desert species, darkness reduces predation risk, and nocturnal niches avoid competition with diurnal species. Owls have evolved highly asymmetrical ears for precise sound localization, rod-dominated retinas for low-light vision, and silent flight feathers. Many mammals shifted to nocturnality during the Mesozoic to avoid dinosaur predators.