Tired Migratory Birds Risk Their Lives Burying Their Heads For Better Sleep
For any animal not at the top of the food mountain range , slumber involves increase risk from marauder . Some migratory songbird deal with this by sleeping lightly , ready to respond to risk . However , when they get really worn down they desert this approach , tucking their head into their feathers to sleep . They ’re more in peril in this pose , but sometimes you just do n’t care ....