A red knot is a tiny shorebird that makes an epic 9000-mile journey all the way from the arctic to the tip of southern Chile and back. Biologists and nature enthusiasts congregate at various points ...
Scientists trained three carrion crows to produce one, two, three or four vocalizations based on various visual or auditory cues. pete beard via Flickr under CC BY 2.0 DEED Carrion crows, European ...
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