Research conducted using mallard ducks sleeping in a row found that those at the end of the row spent a third of their sleep time with half their brain awake.
Jauni atklājumi liecina, ka putni var izlemt, vai ļaut aizmigt visām smadzenēm vai pusi no smadzenēm paturēt nomodā, lai tā vadītu šo aci, kas uzrauga apkārtni.