PhysOrg Posted September 10, 2014 Share Posted September 10, 2014 Migratory songbirds enjoy the best of both worlds—food-rich summers and balmy winters—but they pay for it with a tough commute. Their twice-a-year migrations span thousands of miles and are the most dangerous, physically demanding parts of their year. Read the full article on PhysOrg Link to comment Share on other sites More sharing options...
ScienceDaily Posted September 10, 2014 Share Posted September 10, 2014 Bird migrations follow areas of new plant growth -- a so-called 'green wave' of new leaves and numerous insects -- research shows. In fall, particularly in the western US, they stick to higher elevations and head directly southward, making fewer detours along the way for food. Read the full article on ScienceDaily Link to comment Share on other sites More sharing options...
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