This sea otter, about to eat a crab in the Elkhorn Slough National Estuarine Research Reserve, is cute, sure. But more importantly, it's indirectly combating some harmful effects of agricultural runoff and protecting the underwater ecosystem. Rob Eby/AP hide caption

itoggle caption Rob Eby/AP

A horse-drawn carriage operator waits for riders near Central Park in New York on October 20, 2014. Mayor Bill de Blasio is backing legislation that would ban such carriages in 2016. JEWEL SAMAD/AFP/Getty Images hide caption

itoggle caption JEWEL SAMAD/AFP/Getty Images

Frederic Cesbron (right) and Maxim Durand walk on the street outside the Hyatt Regency O'Hare hotel in Rosemont, Ill., on Sunday. Thousands of people were evacuated earlier after a chlorine gas leak at the hotel, which is hosting the 2014 Midwest FurFest convention. Nam Y. Huh/AP hide caption

itoggle caption Nam Y. Huh/AP

By increasing the amount of serotonin in the spinal cord, an experimental drug helps nerve connections work better. Bee Smith/Ocean/Corbis hide caption

itoggle caption Bee Smith/Ocean/Corbis

Do you want to go to the park? Mango Doucleff, of San Francisco, responds to her favorite command by perking up her ears and tilting her head. Michaeleen Doucleff/NPR hide caption

itoggle caption Michaeleen Doucleff/NPR

A group of wild turkeys surrounds Joanna Tierno on Mason Avenue in Staten Island. She loves to see the birds roaming the streets of her neighborhood. Courtesy of David Karopkin hide caption

itoggle caption Courtesy of David Karopkin

A 40-pound tom turkey flaps his wing as Chris Conley carries him to a pen at Raymond's Turkey Farm in Methuen, Mass., on Friday. The farm raises approximately 20,000 broad-breasted white turkeys per year. Elise Amendola/AP hide caption

itoggle caption Elise Amendola/AP

A turkey vulture makes quick work of a dead rabbit at Martin Luther King Jr. Regional Shoreline park in Oakland, Calif. Sebastian Kennerknecht/Minden/Corbis hide caption

itoggle caption Sebastian Kennerknecht/Minden/Corbis