Cathemeral
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A cathemeral organism is one that has sporadic and random intervals of activity during the day or night in which food is acquired, socializing with other organisms occurs, and any other activities necessary for livelihood are performed.
Until the late 1970ies activity patterns of primates were only categorized as diurnal or nocturnal. The cathemeral activity pattern was first described by Tattersall in 1979.
Tattersall, I. (1979). "Patterns of activity in the mayotte lemur, Lemur fulvus mayottensis." JOURNAL OF MAMMALOGY 60: 314-323.
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