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Investors wiped more than $200 billion of the market value of Facebook owner Meta after the company warned of weaker advertising growth and reported its first-ever decline in daily users.

NPR's Ari Shapiro talks with Ben Rhodes, former advisor to President Obama, about his new book which explores the decline of democracy abroad — and warns that it could happen here, too.

A study of more than 120,000 brain scans shows rapid growth before age 2 and accelerating decline after age 50. The results may one day help pick up abnormalities in the developing brain.

A new study shows that as people mostly remained indoors during lockdowns last year, many bird species found less noisy and polluted cities more inviting.

New Zealand's unique birds are at risk of extinction, like the kiwi. So the country is trying to eradicate the invasive species that prey on them. Everyday people are lining up to help.

After the dinosaurs disappeared, the world saw an explosion of birds and mammals. But a study suggests a burst of new snakes appeared, too, with diets to match the newly expanding array of animals.

Laser beams that sweep erratically across crops have shown promise in protecting harvests from loss caused by birds. But researchers are still studying whether the beams may harm the animals' retinas.

The Justice Department has declined to bring criminal charges against anyone at the CIA or the Senate Intelligence Committee, in a dispute over access to sensitive materials on enhanced interrogations. The power struggle relates to a long-running Senate probe over the mistreatment of detainees after Sept. 11.

Something good recently happened to the town of Brinkley, Ark. The ivory-billed woodpecker, last seen in 1944, was rediscovered nearby. Independent radio producers Dan Collison and Elizabeth Meister and singer-songwriter Sufjan Stevens collaborate on a tribute to Brinkley and its rare bird.

Thailand has killed more than 40 million chickens this year in an effort to stop a deadly strain of bird flu that's killed at least 17 people in the country. But the virus keeps resurfacing. NPR's Jon Hamilton reports.

Caroll Spinney, 84, has performed the roles since the show's very first episode. "I will always be Big Bird," he said. "And even Oscar, once in a while!"

The former Trump aide's appearance before the Judiciary Committee is the first time an official from the White House agreed to show up. But Democrats said she declined to answer many questions.

One veterinarian at a shelter in New York has become infected with a rare bird flu that infected dozens of cats there. The vet had only mild illness and recovered, as have all but one of the cats.

In Kansas, some cattle are now wearing GPS trackers. It's part of a plan to see if invisible fences can help ranchers grow healthy grass while also protecting disappearing prairie birds.

NPR's Michel Martin speaks with Democratic strategist David Axelrod about Jake Tapper and Alex Thompson's book, which explores Biden's decline and how his inner circle has concealed it from the public.

New Zealand plans to eradicate millions of invasive animals that threaten its rare birds. The goal may be out of reach unless new technology makes it possible.

The USDA says "several" staffers working on the bird flu response were terminated over the weekend, and "we are working to swiftly rectify the situation and rescind those letters."

A grand jury declined to indict the white woman whose accusation set off the lynching of Black teenager Emmett Till in 1955. The grand jury determined that there was not sufficient evidence.

In 2017, the Trump administration scaled back protections of the Migratory Bird Treaty Act. A federal judge has now struck down the rule change — and cited To Kill a Mockingbird in so doing.

NPR's Ailsa Chang talks with biologist Johannes Fritz, who's currently on a journey to teach northern bald ibises how to migrate for winter. The birds species was previously extinct in central Europe.