Adult, American Sparrow, Animal, Bay Area, Binocular, Biologist, Bird, Building, California, Caucasian Appearance, City, Color Photograph, Cultural, David Luther, Day, Emberizidae, Female, Horizontal, House, Kate Gentry, Least Concern, Lobos Dunes, Looking, Male, Man, Microphone, Mid Adult, North America, Nuttall's White-crowned Sparrow, Outdoors, Presidio, Recording, Research, Researcher, Researching, San Francisco, San Francisco Bay Area, Science, Scientist, Side View, Songbird, Sparrow, Two People, United States, United States of America, Urban, USA, Waist Up, Watching, White-crowned Sparrow, Wildlife, Woman, Young Adult, Zonotrichia leucophrys, Zonotrichia leucophrys nuttalli, Zonotrichia sp