These neurons in the abdomen help form the gut-brain connection Scientists have identified two types of brain cells in the abdomen that appear to control different aspects of digestion. Jon Hamilton
Orcas are hunting whale sharks. Is there anything they can't take down? Killer whales off Mexico have developed coordinated hunting skills to take down whale sharks, adding to their reputation as the ocean's top predator. Lauren Sommer
Monarch butterflies will get federal protections as a threatened species U.S. officials decided to extend protections to monarch butterflies after warnings from environmentalists that populations are shrinking and the beloved pollinator may not survive climate change. The Associated Press
Arctic tundra now emits planet-warming pollution, federal report finds Arctic tundra is releasing greenhouse gases into the atmosphere as hotter temperatures melt frozen ground and wildfires increase. Barbara Moran
Photos: When hungry elephants and people clash in a village Their job is to keep the peace amid a worsening and at times deadly conflict between humans and the world's largest land animal in the town of Livingstone, Zambia. Text and photos by Tommy Trenchard
A wolf walks into a flower — and appears to pollinate it The bees and ... the wolves? Turns out, the Ethiopian wolf may be a pollinator, too. Ari Daniel
How many species could go extinct from climate change? It depends on how hot it gets. A new study projects biodiversity threats if global warming speeds up. Under the most extreme scenarios, about one in three species could be facing extinction by the end of the century. Jonathan Lambert
Young people are dying of heat and their risks could grow, study finds Scientists have pointed out that extreme heat is particularly dangerous for older people. A new study shows that young, healthy people are also dying too often in extreme weather. Alejandra Borunda
She's 74 — and expecting: Wisdom the albatross astounds once again It started in the Eisenhower era: Every year, Wisdom, a Layan albatross, has returned to her nesting grounds on the Midway Atoll in the Pacific Ocean. Bill Chappell
Slingshot spiders rely on good vibrations to catch supper The tiny ray spider uses launches its web to grab its prey out of the air. Though common practice in the superhero world, this ability is actually unusual in spiders. Ari Daniel
