The doctors, patient, and ethics behind the experiment.

On the mountain lions of Los Angeles.

On Timothy Treadwell, who lived and died with the bears of Alaska.

A couple deals with animal complications, unhappiness, and terminal illness.

A dispatch from a Russian town under siege by hungry bears.

An adventure on an Alaskan glacier with a new best friend.

“Two weeks before Christmas, I was explaining to a friend in town that if I seemed more distressed than usual, it was just because I was trying to accustom myself to the fact that my cat didn’t want to be my cat anymore. ‘No way,’ she said. ‘Here’s what you do: You just call Dawn.’ And then she gave me the cat psychic’s phone number.”

A story of medical ailments, family dynamics, and conservation work.

A taxidermist's life gradually spins out of control.

An attempt to make sense of the dog meat industry in Vietnam, an unregulated maze of black market slaughterhouses, home restaurants, and thieves who are often murdered in the open when caught stealing the family pet.

The surprising bond between damaged birds and traumatized veterans.

The life and death of a gorilla named Julia.

Dolphins may have the capacity for mourning, and elephants sometimes bury their dead.

Life at a roadside zoo with ligers, orangutans, and an elephant in Florida.

There’s a new endangered species in rural America: veterinarians.

The life of Kimi Peck, a former screenwriter, once married to Gregory Peck’s son, who turned to “saving” stray dogs.

On the man who has turned the grunt work of packing into a social media phenomenon.

A vegan sets out to see if there’s an ethical, sustainable way to eat fish in 2015.

One man’s quest to witness the “Bison Cull” in Yellowstone National Park.

On our relationship with wild horses.

We are disgusted by butchery, even as we eat more meat than ever.

The question for researchers isn’t “How smart are dolphins?” It’s “How are dolphins smart?”

The writer’s obsession with a genus of snake known as “indigo.”

On the rapid disintegration of the ecosystem in Las Vegas.