| http://www.w3.org/ns/prov#value | - More than 60,000 of them punctuate the High Plains. ???Canvasbacks, gadwall, shovelers, teal, pintails and other migratory waterfowl depend on them,??? says Dennis Buechler, a retired U.S. Fish and Wildlife Service ecologist and director emeritus of the Colorado Wildlife Federation. ???So do shorebirds and many other species like yellow-headed blackbirds and marsh wrens.???
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