PhysOrg Posted October 29, 2014 Share Posted October 29, 2014 Unable to fly, nestling birds depend on their parents for both food and protection: vocal communication between parents and offspring helps young birds to determine when they should beg for food and when they should crouch in the nest to avoid a predator seeking an easy meal. Read the full article on PhysOrg Link to comment Share on other sites More sharing options...
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