Aviva DeKornfeld has the story of Leisha Hailey, who was certain she had the next million-dollar idea. (11 minutes)

Editor David Kestenbaum speaks with Jeff Permar, who is trapped in a Groundhog Day situation — with an actual groundhog! (9 minutes)See more videos of the groundhog Chunk on Jeff’s YouTube channel.

Producer Aviva DeKornfeld talks to a man who finds himself the target of vengeful crows.

This story is about a creepy and dangerous creature that does all kinds of terrible things.

Daniel Alarcón takes us back to the early 90’s when Keiko lived in an adventure park in Mexico City, swimming with human friends. (43 minutes)

Ira talks to two members of a recreational swimming club who intentionally swam straight toward a shark that had just bitten their friend. (10 minutes)

A father and son find themselves in a very traditional relationship. Until the end. (21 minutes)Rick McIntyre told this story in his book The Rise of Wolf 8: Witnessing the Triumph of Yellowstone's Underdog.

Brothers Wes and Jeff spent a winter tagging black bears in Bryce Canyon National Park. One of the bears they needed to tag decided to hibernate at the end of an usually long tunnel.

A species of massive, mysterious, highly intelligent beings have recently been making contact with humanity. Or our boats, anyway.

At the announcement of New York City’s inaugural rat czar, we meet Darneice Foster, who despises the rats outside her apartment.

There are certain jobs where thinking about someone else’s life is just built into it. Aviva DeKornfeld has a theory that petsitting is a job like that.

Lilly Sullivan talks with former science reporter, Kelsey Padget, who’s on a mission to disabuse the world of its incorrect assumptions about an allegedly murderous creature: the black widow spider. (10 minutes)Kelsey Padgett will be hosting an upcoming weekly podcast about big history rivalries and gossipy petty feuds. Dr.

Senior Editor David Kestenbaum talks with a different kind of advocacy group: animal scientists doing their best to save a particular species before it winks out of existence. (16 minutes)

As a joke, Jessica Williamson posts a fake “CAT FOUND” poster with pictures of a possum instead of a cat. To her surprise, she gets hundreds of phone calls that ultimately shift her view on humanity.

For most of their history, salmon were born upstream and swam to the ocean before coming back as adults to spawn. But humans have disrupted the route the salmon take to the ocean.

At the age of 17, competitive swimmer Lynne Cox had already accomplished a lot in the open ocean. She’d set two world records crossing the English Channel.

Senior editor David Kestenbaum helps his kids set up an ant farm. They follow all the instructions, to the letter! But he ends up learning a lesson he’s pretty sure the manufacturer did not intend.

Ira goes out birding with birder extraordinaire Noah Strycker, who tells the dramatic story of the bird that changed his life: the turkey vulture.