PhysOrg Posted February 8, 2012 Share Posted February 8, 2012 Imagine an environment filled with wind, storms, predators, noise, and limited food and shelter. Then imagine providing and caring for a tiny egg or peeping baby bird in those conditions. The tree swallow and most other wild birds face these stressful challenges on a day-to-day basis. View the full article Link to comment Share on other sites More sharing options...
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