diurnal, nocturnal (in CC amphib glossary)

fishkeeper

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diurnal: Active by day

Nocturnal: Active by night. Most caudates are nocturnal.
 

MRIGUY

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Both term can also be used to describe the timming of a recurring event such as a plant that opent its leaves every morning etc.
 

Jennewt

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Isn't there also a term for animals that are active at dawn/dusk?
 

Jan

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The time span during a 24-hour day that animals display their greatest activity can be described by adjectives defining three separate photoperiods:

Diurnal – most active during daylight hours
Nocturnal – most active at night during darkness (most caudates are nocturnal)
Crepuscular – most active during twilight hours at dawn and dusk

The term 'activity' within this context refers to natural or normal functions and may include: movement, feeding, hunting, migration, breeding, nest building, etc.
 

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Well, I think that just about says it all.
 
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