"An intrepid bird called the red knot migrates from the southern tip of South America to the Arctic and back every year. But changes in climate along its route are putting this ultramarathoner at risk."

"Federal wildlife refuges in the Northwest and Hawaii will phase out a class of pesticides that are chemically similar to nicotine because they pose a threat to bees and other pollinators key to crop growth."

"ROCKLAND, Maine — Decades after gray seals were all but wiped out in New England waters, the population has rebounded so much that some frustrated residents are calling for a controlled hunt."

"CASPER, Wyo. — In a new oil field among the rolling hills near here, Chesapeake Energy limits truck traffic to avoid disturbing the breeding and nesting of a finicky bird called the greater sage grouse. To the west, on a gas field near Yellowstone National Park, Shell Oil is sowing its own special seed mix to grow plants that nourish the birds and hide their chicks from predators."

"LEES FERRY, Ariz. — In this corner of America known for its vast landscapes, rugged mountains and deep river canyons, signs of the havoc created by the minuscule tamarisk beetle are everywhere."

"Across 685 miles of beaches from North Carolina to Mississippi, loggerhead sea turtles now swim in federally protected waters."

"Pesticides don't just kill pests. New research out of the Netherlands provides compelling evidence linking a widely used class of insecticides to population declines across 14 species of birds."

"Kinder Morgan’s plans to expand a pipeline pose major environmental threats -- especially to whale populations still reeling from past oil spills and noise pollution."

"Lack of land for endangered puma has US officials preparing payment plan to ranchers, many of whom resent the cats."

"DENVER — An obscure, chicken-sized bird best known for its mating dance could help determine whether Democrats or Republicans control the U.S. Senate in November."