In Montana's Centennial Valley, conservationists made a grievous mistake while trying to save the trumpeter swan — they nearly wiped out Arctic grayling trout. Now they're looking for ways to make sure both species get a place on the ark.
The chicken-size sage grouse is as much a part of America's Western range as antelopes and cowboys. The birds nest beneath sagebrush, and as it disappears, so do the grouse. Biologists hope to protect the bird without starting a 21st century range war.
A nearly 40-pound rockfish caught off the southwest coast of Alaska was thought to be nearly 200 years old. The answer lay in the watery beast's ear bones, which were examined in a lab in Juneau, Alaska. Robert Siegel and Audie Cornish have more.
Nuclear bomb tests in the 1950s and '60s pumped a lot of radiocarbon into the atmosphere. It went everywhere, including into plants that elephants eat. By measuring the levels of this carbon in elephant tusks, scientists can tell when an elephant died — and whether the ivory is being traded illegally.
When a white-throated needletail was spotted off the northwest coast of Scotland, dozens of enthusiasts rushed to the area. "Twitchers" is British slang for those who have a passion for spotting hard-to-find birds. But their joy turned to grief when the little bird from Asia hit a wind turbine.
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