Decades ago, India’s tigers were on the brink of extinction. Slowly, their numbers have rebounded. But that ecological success has prompted a dire problem—and a race to save many of them from genetic ...

Picture an animal that huddles up with others when stressed, babysits its young, hangs out around relatives, and gathers in big groups every year. Did you imagine a rattlesnake? For a long time, ...

The flapping wings of millions of monarch butterflies at the Monarch Butterfly Biosphere Reserve in Michoacán, Mexico, create a fluttering sound that Alfonso Alonso describes as “magical.” The ...