Like most of Swift's species, the Great Dusky Swift (Cypseloides senex) can be found perching in vertical cliffs. But, this particular species takes its habitat to the extreme and, being known in ...
ON seeing the great waterfall at Iguaçu, Eleanor Roosevelt famously exclaimed “poor Niagara!” And well she might; the river separating Brazil and Argentina plunges over an 80 metre-high cliff in a ...
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