CNN
Birds sleep with one eye open, half awake, study finds graphic
February 3, 1999
Web posted at: 9:38 p.m. EST (0238 GMT)
http://edition.cnn.com/TECH/science/9902/03/birds.eye/
CNN
Birds sleep with one eye open, half awake, study finds graphic
February 3, 1999
Web posted at: 9:38 p.m. EST (0238 GMT)
http://edition.cnn.com/TECH/science/9902/03/birds.eye/