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Circadian activity patterns were measured in the solitary, subterranean Cape molerat, Georychus capensis, under fixed 12:12 LD, constant dark Dd, and constant light LL photoperiods for 250 consecutive days using passive infra-red activity sensors. The molerats displayed significant nocturnal activity rhythms under 12:12 LD and free-running rhythms (23.5 h < τ > 25.8 h) under constant conditions...
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