Golden lion tamarins are one species that are largely monogamous. Felipe Dana/AP hide caption

itoggle caption Felipe Dana/AP

The remains of a tree are seen in front of a boulder in the Dome Wilderness area of New Mexico in August 2012. The Las Conchas Fire torched the land in 2011, burning through more than 150,000 acres of forest. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

Echolocation is second nature to animals such as bats and dolphins. Can humans also find their way using sound as a tool? Ian Waldie/Getty Images hide caption

itoggle caption Ian Waldie/Getty Images

Biologists normally look for the hellbender slamander, which is known by the nickname "snot otter," under rocks in streams. But now there's a gentler way: They can take water samples and look for traces of the animals' DNA. Robert J. Erwin/Science Source hide caption

itoggle caption Robert J. Erwin/Science Source

A harmful trio (from left): a deer tick, lone star tick and dog tick. Getty Images hide caption

itoggle caption Getty Images

Bottle-nosed dolphins leap out of the water near Dana Point, Calif. David McNew/Getty Images hide caption

itoggle caption David McNew/Getty Images

Pandoraviruses were discovered lurking in the mud of Chile and Australia, half a world apart. courtesy of Chantal Abergel and Jean-Michel Claverie hide caption

itoggle caption courtesy of Chantal Abergel and Jean-Michel Claverie

Wood fibers are coated with carbon nanotubes and then packed into small disks of metal. The sodium ions moving around in the wood fibers create an electric current. Heather Rousseau/NPR hide caption

itoggle caption Heather Rousseau/NPR