PhysOrg Posted August 19, 2019 Share Posted August 19, 2019 When driving across country, people can only make it so far before stopping off to rest. Likewise, most migratory songbirds must make stops during their long-distance journeys to sleep along the way. Now, researchers have evidence that songbirds tuck themselves in differently depending on just how worn out they really are. View the full article Quote Link to comment Share on other sites More sharing options...
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