The unique genetic change that turned horses into athletic powerhouses A new study suggests genetic changes allow horses to produce more energy, while minimizing the toll the energy takes on cells. Jonathan Lambert
What does the shark say? Click, click, click Scientists in New Zealand believe they may have the first-ever recording of a shark making noise. Julie Depenbrock
Black cat adoptions are up. An Oscar-winning animated movie may have helped The Oscar-winning animated movie "Flow," which stars a black kitty, may be causing an increase in black cat adoptions. Superstitions about bad luck have often caused these felines to be overlooked. Ryan Benk
Montana's skies come alive with spring bird migration Each spring, hundreds of thousands of swans, geese, cranes and other waterfowl descend on a Montana lake on their way to the Arctic. A small town festival draws thousands of bird fans. Ellis Juhlin
March Madness is underway. So is March Napness, the tournament for hibernating bears 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. Kaity Kline
Male octopuses are usually killed by females after mating. Now, they may have found a way out A male blue-lined octopus often becomes their partner's meal after mating but the University of Queensland's Fabio Cortesi tells NPR's Ayesha Rascoe some males have found a way to survive. Ayesha Rascoe
How land-loving iguanas from North America may have ended up in Fiji A new study suggests iguanas reached Fiji by rafting around 5,000 miles from North America. Jonathan Lambert
Grab your binoculars — Seattle's skies abound with eagles this season The skies above Seattle have been busy with lots of bald eagles as spring approaches. Meanwhile, local bird enthusiasts say the season seems busier than usual this year. Casey Martin
These scientists are building a cat database to understand why they act like that The project, called Darwin's Cats, aims to enhance our understanding of feline behavior and genetics. Manuela López Restrepo
Doing yoga near ambling elephants can be therapeutic for veterans An elephant ranch in Florida is offering yoga classes for veterans to help them with trauma. From the other side of a fence, retired elephants eat and mosey around. Kerry Sheridan