"Humans are throwing ecosystems out of whack by not only killing a large number of animals, but by killing adults and top carnivores in particular, a study suggests. One answer is to act more like animal predators."

"If humans hope to fish the oceans more sustainably, they are going to have to start fishing like fish, a new study suggests.

That means harvesting younger, smaller fish to leave more of their elders to continue maturing and reproducing. And it means fishing quotas that are more in line with what nonhuman predators consume.

"The natural world is abuzz with the sound of animals communicating — crickets, birds, even grunting fish. But scientists learning to decode these sounds say the secret signals of African elephants — their deepest rumblings — are among the most intriguing calls any animal makes."

"FRONT ROYAL, Va. — The five red panda cubs in large boxlike cribs at the Smithsonian Conservation Biology Institute here are bottle-fed, sleepy and wobbly on their legs. They have bandit masks and thick, rich fur, and they make soft squealing noises and something called a huff-quack, which sounds like … a huff-quack."

"A toxic algae bloom that began off the West Coast this spring now stretches from California to Alaska. It’s poisoning marine life from shellfish to sardines to sea lions, and scientists say it’s one of the worst they’ve seen."

"YELLOWSTONE NATIONAL PARK, Wyo. — Even for a park with a history of unhappy encounters between people and wildlife, 2015 is shaping up as an eventful year for Yellowstone and its bison. Since mid-May, five visitors have been hurt — gored, trampled or tossed into the air — in run-ins with the park’s most famous residents."

"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."