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African elephants sleep shortest -- just 2 hours day
African elephants -- the largest land animal -- sleep for just an average of two hours a day and regularly survive for nearly two days without sleep, a study has found.
Johannesburg: African elephants -- the largest land animal -- sleep for just an average of two hours a day and regularly survive for nearly two days without sleep, a study has found.
Previous studies of sleep in captive elephants have shown that they sleep for four to six hours per day. The research team monitored two free-roaming African elephant matriarchs in Chobe National Park in Botswana for 35 days.
The elephants were implanted with an actiwatch, in the trunk to track sleep accurately and a collar with a gyroscope to track sleeping position.
The researchers found that the elephants slept an average of two hours a day -- the shortest known sleep time of any land mammal. On several days, the elephants were found to survive without sleep for up to 46 hours.
They travelled long distances of around 30 km during these periods, possibly due to disturbances such as lions or poachers and were found to sleep lying down only every few nights.
