Behavioural sleep in the giraffe (Giraffa camelopardalis) in a zoological garden

  title={Behavioural sleep in the giraffe (Giraffa camelopardalis) in a zoological garden},
  author={Irene Tobler and Barbara Schwierin},
  journal={Journal of Sleep Research},
Behavioural sleep was assessed for 152 nights in 5 adult, 2 immature and 1 juvenile giraffes at a zoological garden, using continuous time‐lapse video recording. Sleep occurred while the giraffes were standing (SS) and in recumbency (RS). Paradoxical sleep (PS) was recognized by the peculiar positioning of the head on the croup and by phasic events. The 24‐h sleep profile had a main bimodal nocturnal sleep period between 20.00 and 07.00 hours, with a trough between 02.00 and 04.00 hours, and… 
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