"A mother grizzly bear, linked by DNA testing to the fatal mauling of a hiker whose body was found partially eaten in Yellowstone National Park, was euthanized on Thursday, park officials said."

"Conservation groups are accusing the U.S. Fish and Wildlife Service of withholding research showing a federal plan to kill seabirds on the Columbia River would not actually benefit salmon and steelhead."

"Last September, the remote community of Point Lay on Alaska’s North Slope became the focus of headline news when a staggering 35,000 walruses crowded onto the shore nearby. And now, some scientists are saying a similar event could happen this summer — in fact, any time now."

"Scientists have identified a new problem for amphibians, which are already shrinking in numbers: A parasite is infesting tadpoles worldwide."

"Humpback whales don't just sing songs — they compose with the whales around them, singing a song that evolves over time. Scientists didn't know that until they started recording whale sounds in the 1960s and spent years listening."

"The lesser prairie chicken population appears to be on the rebound a year after the U.S. Department of Fish and Wildlife placed the bird in threatened status."

"Conservationists declared victory on Wednesday in a legal battle over Idaho's systematic killing of wolves in a national wilderness area after the state notified federal land managers it did not intend to reinstate a controversial kill program."

"Dolphins tend to strike a deep emotional chord in many people who encounter them. Famous for their intelligence and physical ability, there have been reports that the marine mammals have come to the rescue of humans at sea."

"Three American airlines announced they will no longer ship lion, leopard, elephant, rhino, or buffalo killed by trophy hunters."

"Greater sage grouse numbers in the West have grown by nearly two-thirds since 2013, marking what could be a significant rebound to the bird's previous several years of decline, according to scientists in Western states."