The research of British naturalist Alfred Russel Wallace (1823-1913) played a pivotal role in developing the theory of natural selection. But over time, Charles Darwin became almost universally thought of as the father of evolution. Hulton-Deutsch Collection/Corbis hide caption

itoggle caption Hulton-Deutsch Collection/Corbis

Berkshire pigs on Happy Hula Farm, a member of the Eden Farms collective. Amy Mayer/Iowa Public Radio hide caption

itoggle caption Amy Mayer/Iowa Public Radio

Researchers are using small remote-controlled planes to survey the populations of the greater sage grouse. Stephen J. Krasemann/Science Source hide caption

itoggle caption Stephen J. Krasemann/Science Source

In this Jan. 18 photo provided by the NYU Langone Medical Center, a technician examines mice to determine their health at the hospital's complex in New York. New York University/AP hide caption

itoggle caption New York University/AP

A Fish and Wildlife Service team caught and killed an alligator after the animal attacked a 6-year-old boy Friday. The boy survived with only incidental wounds. U.S. Fish and Wildlife Service hide caption

itoggle caption U.S. Fish and Wildlife Service

The Miami-based Cat Network operates a program that traps, neuters and releases feral cats back to their colonies. A bill before the Florida Legislature would offer legal protection to those programs. Greg Allen/NPR hide caption

itoggle caption Greg Allen/NPR