"The world’s smallest porpoise, the vaquita, is slipping closer to extinction despite the Mexican Navy’s efforts to protect it and its habitat from illegal fishing, experts have warned."

"Yellowstone National Park managers on Monday warned visitors to leave wildlife alone after two tourists put a newborn bison calf in their car, touching off a string of events that led to the animal's death."

"As Donald Trump seeks to win over skeptical Republicans on Capitol Hill and fence-sitting voters, he seems to have wooed one important voting bloc: sportsmen."

"A U.S. government plan to lift Endangered Species Act protection of the grizzly bear in and around Yellowstone National Park drew a torrent of criticism from environmentalists and Indian tribes as the public comment period for the proposal came to a close on Wednesday."

"Seven Native American tribes in Oklahoma will provide habitat and food on their lands for monarch butterflies, whose numbers have plummeted in recent years due to troubles along their lengthy migration route."

"Under the threat of another legal battle, the U.S. Bureau of Land Management has pulled the plug on a public-private partnership in northern Nevada aimed at shrinking the size of a wild horse herd through the use of contraceptives, according to documents The Associated Press obtained on Tuesday."

"After two years of improvement, America's honeybees had another tough and deadly winter, probably because of mites, according to a new federal survey released Tuesday."

"North America's bison, a living emblem of the Western frontier that roamed the continent by the millions before being hunted to near extinction in the late 1800s, was officially designated on Monday as the national mammal of the United States."

"Member states of the U.N. Convention on International Trade in Endangered Species (CITES) are not meeting until September, but some African countries have already drawn their battle lines on divisive issues such as the ivory trade."

"Leopards are reclusive and known for their ability to adapt, traits that have led some wildlife biologists to assume that the animals remained relatively abundant in the wild. But a study published Wednesday suggests that leopards have lost as much as 75 percent of their historical range since 1750."