During the Last Glacial Period some 11,500 years ago, Greenland went through massive changes called interstadial events. Then, it quickly oscillated between lower and higher temperatures, which melted and then refroze (and then melted again) massive ice sheets in the region. Geological records appear to show that around the same time…
Hundreds of thousands of years ago, a glacier advanced upon the Pacific Northwest, its ice forming a natural barrier that fractured crows into two populations. These populations began to diverge into two separate species, which ornithologists decided were distinguishable by small differences in body measurements and the sounds they made….
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