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NPR's A Martinez talks to Laura Krantz about her children's book: The Search for Sasquatch. Krantz hopes to model how to balance curiosity and exploration with staying grounded in the facts.

Authorities have been unable to find the bear that killed a woman near Yellowstone National Park late last month. The attack has renewed calls to take grizzlies off the endangered species list.

Henry Hoke's new novel Open Throat follows the perspective of a hungry mountain lion. NPR's Scott Simon speaks with Hoke, who was inspired by the real life story of the cat "P-22" in Los Angeles.

NPR's Ayesha Rascoe asks Rae Wynn-Grant about her journey to becoming an ecologist. Grant writes about it in her memoir, "Wild Life: Finding My Purpose in an Untamed World."

A mysterious die-off of freshwater mussels has biologists scrambling to figure out a cause. Freshwater mussels are critical to river ecosystems and to U.S. water supplies.

Many economists and business leaders are raising alarms about falling birthrates. But advocates for lower human populations say a less crowded world will be happier and more sustainable.

Verlon Jose, vice chairman of the Tohono O'odham Nation, says President Trump's proposed border wall would cut through the reservation, with negative impacts.

Many farmers have had to fallow land as a state law comes into effect limiting their access to water. There's now a push to develop some of that land … into solar farms.

From her messy office at the Smithsonian, ornithologist Roxie Laybourne changed aviation and crime investigation. NPR's Scott Simon talks with Chris Sweeney about his book, "The Feather Detective."