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The sound of fear is universal. Screams of mammals have similarities -- irregularities in the sound -- that are meant to draw attention.

With a few days likely left in the Iditarod, officials have given one of the frontrunners a two-hour time penalty.

There are many ways to kill a river. With Southeast Asia's storied Mekong, China's upriver damming is taking a heavy toll, but downstream neighbors share the blame. The No. 1 threat: sand mining.

With good rains for the past two years in Kenya, Amboseli National Park has seen an elephant baby boom, including two rare sets of twins.

Crawfish frog numbers are on decline due to habitat loss. But scientists in Indiana are working to return species to a historic site.

Scientists filmed bats to see how they communicate while swarming. They found a surprise: In urban settings, rats attack bats. What are the implications for bats ... and virus spread to humans?

Butterflies of all kinds of species, in all parts of the country, have declined by one to two percent per year since 2000.

Voluntary conservation is embraced by some farmers who get payments. But some governors are comparing Biden's new plan to up conservation goals to a government takeover.

California's salmon fishing season has been canceled — again. The fish have dwindled as a result of drought, heat waves, agriculture and damming.

California's salmon fishing season has been canceled — again. The fish have dwindled as a result of drought, heat waves, agriculture and damming.