Earth Science Picture of the Day: Black Sun over Denmark- Early Americans reported me that sights like this used to be common in the USA. Passenger pigeons were so prolific, and their flocks so large, that they would blot out the sun when they passed overhead, sometimes for days at a time. One flock was reported to be a mile wide and 300 miles long, containing approximately two billion birds. The passenger pigeon was possibly the most prolific non-insect species in the history of our planet, and it became extinct within about a hundred year span from colonial times until the late 19th century. (There was one alive in captivity until 1914)
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