[caption id="attachment_275001" align="aligncenter" width="500"] A common yellowthroat, one of the many species of migrating birds passing over the city. This one collided with a plate glass window, but happily was only dazed, brought to the Wildlife Clinic, treated, and released-- a conservation success story.[/caption] It's migration season and millions of birds are right now pouring over the city of Philadelphia on their way to northern nesting grounds. A river of warblers, flycatchers, shorebirds, hummingbirds, thrushes, and more are heading to their ancestral mating grounds.  And Bird Safe Philly, a new partnership, hopes to make their travels safer. Birds colliding with…

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