American pioneers saw the endless stretches of grassland of the Great Plains as a place to produce grain and beef for a growing country. But one casualty was the native prairie ecosystem and animals that thrived only there.
Some biologists are trying to save the prairies and they've picked a hero to help them: the black-footed ferret. In trying to save this long skinny predator with a raccoon-like mask, the biologists believe they have a chance to right a wrong that nearly wiped a species off the planet.
What would you pay for a fossil of two complete dinosaurs locked in what seems to be a fight to the death? An auction house put that question to the test with the dinosaurs, discovered in 2006 in the Hell Creek formation of Montana. It got an unexpected answer.