Veterinarians at the National Zoo say their female giant panda, Mei Xiang, is ready to breed again.

Fly from Angola down to South Africa and you'll see thousands of circles of bare dirt covering the land. They're up to 30 feet across and ringed by tufts of grass. The origin of the shapes has long been a mystery, but researchers now say hordes of termites may be acting as engineers.

More than 200 manatees have died in Florida's waterways this year from an algae bloom called red tide. The deaths come as wildlife officials try to remove the marine mammal — whose biggest killer is usually boat propellers — from the endangered species list.

Trained marksmen with the U.S. Department of Agriculture are on a four-night deer hunt to reduce deer density in Rock Creek Park.

How do oysters attach themselves to rocks? They need a glue, but a glue that can set in a watery environment. In this installment of "Joe's Big Idea," NPR's Joe Palca reports that glue could lead to medical advances.

Shrimp is the number one seafood product in the United States. While most shrimp is imported from Asia or Ecuador, some is being raised indoors in the Midwest. The challenge is to simulate an ocean environment in a barn or other structure.