National Adopt a Shelter Pet Day is on April 30. To celebrate, NPR wants to know how your pet has changed your life. We would also love to see photos of your purr-fect fur-ever friend.

Scientists in New Zealand believe they may have the first-ever recording of a shark making noise.

A new study suggests genetic changes allow horses to produce more energy, while minimizing the toll the energy takes on cells.

A handful of rescued bears in Europe are competing in March Napness, a bracket-style tournament to see what bear can stay in hibernation the longest.

A new study suggests iguanas reached Fiji by rafting around 5,000 miles from North America.

The project, called Darwin's Cats, aims to enhance our understanding of feline behavior and genetics.

A dying red oak was about to be felled when a bird’s parental instincts kicked in.

Outdoor enthusiast Sam Jones left Australia after posting a video of herself separating a baby wombat from its mom on a dark road. Australians are cheering her departure and worrying about the animal.

Over the next 10 years, the North Atlantic Right Whale, the Chattooga River crayfish and the Sicklefin Redhorse fish may get some outsized attention from conservationists.

Intriguing video of narwhals using their tusks to mess with fish has scientists speculating about what this behavior might mean.

Butterflies of all kinds of species, in all parts of the country, have declined by one to two percent since 2000.

The aquarium helping Chappy — a nod to the New Haven, Conn., neighborhood where he was rescued last month — said he died of gastrointestinal issues and "was surrounded by love until the very end."

Male alligators rumble during mating displays, but a lesser-known part of the ritual involves something even more dramatic.

New research suggests mice may exhibit revival-like behaviors to help unconscious mice recover faster.

Hurricane, who was a Special Operations Canine for the Secret Service, became the most decorated dog in U.S. history. He died this week at the age of 16.