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Redefine looks at California environmental protection activists whose work has been met with violent opposition. First: John Trudell, who died earlier this month.
A bird that once darkened California's skies is a candidate for listing as an endangered species.
There have been no recorded human deaths at the hands of California black bears. Here's how we can keep it that way.
This Los Angeles-based entomologist didn't set out to document an entirely new ecosystem. He just sort of stumbled on it.
The Peninsular bighorn sheep needs connected habitat to survive into the 22nd century -- and a fortified border won't help.
A new male mountain lion in the Santa Monica Mountains raises questions. Where did he come from? And where did the last male go?
"Pearls of the Planet" is a multi-tiered project by Explore.org. On the site, a live stream from cameras set up around the globe allow viewers access to everything from pandas in Sichuan to bison in Saskatchewan.
An activist who worked for this week's ban on bobcat trapping in California looks back at the complex road to protection.
Crab caught off the California coast right now could give you the worst case of food poisoning ever.
A groundbreaking ceremony marks the start of an audacious plan to save California's largest lake.
Even "catastrophic" wildfires leave ecological treasures in their wake.
The imperiled Pacific fisher is faring worse than expected due to pot growers' use of rat poisons, according to a new study.