"For millions of years, North America was home to a zoo of giants: mammoths and mastodons, camels and dire wolves, sloths the size of elephants and beavers as big as bears. And then, at the end of the Pleistocene Epoch about 12,000 years ago, most of them vanished."

"It is the world’s rarest whale, with only seven of its kind ever spotted. Almost nothing is known about the enigmatic species. But on Monday a small group of scientists and cultural experts in New Zealand clustered around a near-perfectly preserved spade-toothed whale hoping to decode decades of mystery."

"Louisiana has long relied on a vast levee system to rein in the Mississippi River and protect surrounding communities from flooding. But cutting off the natural flow of the river with man made barriers has been slowly killing one of the nation’s largest forested wetlands."

"Recordings by biologist Heike Vester reveal how oil and gas exploration as well as cruises, fishing boats and even whale-watchers are adding to the din underwater"

"The U.S. Fish and Wildlife Service last week finalized a recovery plan for Canada lynx, a species listed as threatened under the Endangered Species Act, and proposed new critical habitat designations to increase federal protections for the winter-adept felines in some areas. "

"Monarch populations have plummeted due to habitat loss, pesticide use and climate change. Eastern monarch populations that migrate between Canada and overwintering sites in Mexico are estimated to have declined by more than 80 percent since the 1990s."

"Raúl Grijalva, the top Democrat on the U.S. House Natural Resources Committee, will not seek to remain in that position in the next Congress, he said in a written statement Monday."

"A federal court this week dealt a blow to calls for new regulations on pesticide-coated seeds used in farming, ruling that US regulators were not acting improperly in exempting the seeds from registration review."