SNAPSHOT USA 2021: A third coordinated national camera trap survey of the United States
Authors: Shamon Hila , Maor Roi , Cove Michael V. , Kays Roland , Adley Jessie , Alexander Peter D. , Allen David N. , Allen Maximilian L. , Appel Cara L. , Barr Evan , Barthelmess Erika L. , Baruzzi Carolina , Bashaw Kelli , Bastille‐Rousseau Guillaume , Baugh Madison E. , Belant Jerrold , Benson John F. , Bespoyasny Bethany A. , Bird Tori , Bogan Daniel A. , Brandt LaRoy S. E. , Bresnan Claire E. , Brooke Jarred M. , Buderman Frances E. , Buzzell Suzannah G. , Cheeseman Amanda E. , Chitwood M. Colter , Chrysafis Petros , Collins Merri K. , Collins D. Parks , Compton Justin A. , Conner L. Mike , Cosby Olivia G. , Coster Stephanie S. , Crawford Benjamin , Crupi Anthony P. , Darracq Andrea K. , Davis Miranda L. , DeGregorio Brett A. , Denningmann Kimberly L. , Dougherty Kyle D. , Driver Ace , Edelman Andrew J. , Ellington E. Hance , Ellis‐Felege Susan N. , Ellison Caroline N. , Fantle‐Lepczyk Jean E. , Farris Zach J. , Favreau Jorie , Fernandez Pilar , Fisher‐Reid M. Caitlin , Fitzpatrick Matthew C. , Flaherty Elizabeth A. , Forrester Tavis D. , Fritts Sarah R. , Gallo Travis , Gerber Brian D. , Giery Sean T. , Glasscock Jessica L. , Gonatas Alex D. , Grady Anna C. , Green Austin M. , Gregory Tremaine , Griffin Noel , Hagen Robert H. , Hansen Christopher P. , Hansen Lonnie P. , Hasstedt Steven C. , Hernández‐Yáñez Haydée , Herrera Daniel J. , Horan Robert V. , Jackson Victoria L. , Johnson Luanne , Jordan Mark J. , Kahano Willaine , Kiser Joseph , Knowles Travis W. , Koeck Molly M. , Koroly Caroline , Kuhn Kellie M. , Kuprewicz Erin K. , Lafferty Diana J. R. , LaPoint Scott D. , Lashley Marcus , Lathrop Richard G. , Lee Thomas E. , Lepczyk Christopher A. , Lesmeister Damon B. , Lombardi Jason V. , Long Robert A. , Lonsinger Robert C. , MacKay Paula , Maher Sean P. , Mason David S. , Millspaugh Joshua J. , Moll Remington J. , Moon Jessica B. , Mortelliti Alessio , Mychajliw Alexis M. , Nagy Christopher M. , Neiswenter Sean A. , Nelson Dana L. , Nemes Claire E. , Nielsen Clayton K. , Olson Elizabeth , O'Mara M. Teague , O'Neill Brian J. , Page Blake R. , Parsons Elizabeth , Pease Brent S. , Pendergast Mary E. , Proctor Mike , Quick Heather , Rega‐Brodsky Christine C. , Rentz Michael S. , Rezendes Kylie , Rich Daric , Risch Derek R. , Romero Andrea , Rooney Brigit R. , Rota Christopher T. , Samples Corey A. , Schalk Christopher M. , Sekercioğlu Çağan H. , Sergeyev Maksim , Smith Austin B. , Smith Daniel S. , Sperry Jinelle H. , Stenglein Jennifer L. , Stokes Michael K. , Stutzman Johnathon S. , Todd Kimberly R. , Vanek John P. , Varga Wren , Wardle Zachary M. , Webb Stephen L. , Wehr Nathaniel H. , Whipple Laura S. , Whittier Christopher A. , Widness Jane S. , Williamson Jacque , Wilson Andrew M. , Wolf Alexander J. , Zimova Marketa , Zorn Adam S. , McShea William J. 
Published: May 2024

SNAPSHOT USA is a multicontributor, long‐term camera trap survey designed to survey mammals across the United States. Participants are recruited through community networks and directly through a website application (https://www.snapshot-usa.org/). The growing Snapshot dataset is useful, for example, for tracking wildlife population responses to land use, land cover, and climate changes across spatial and temporal scales. Here we present the SNAPSHOT USA 2021 dataset, the third national camera trap survey across the US. Data were collected across 109 camera trap arrays and included 1711 camera sites. The total effort equaled 71,519 camera trap nights and resulted in 172,507 sequences of animal observations. Sampling effort varied among camera trap arrays, with a minimum of 126 camera trap nights, a maximum of 3355 nights, a median 546 nights, and a mean 656 ± 431 nights. This third dataset comprises 51 camera trap arrays that were surveyed during 2019, 2020, and 2021, along with 71 camera trap arrays that were surveyed in 2020 and 2021. All raw data and accompanying metadata are stored on Wildlife Insights (https://www.wildlifeinsights.org/), and are publicly available upon acceptance of the data papers. SNAPSHOT USA aims to sample multiple ecoregions in the United States with adequate representation of each ecoregion according to its relative size. Currently, the relative density of camera trap arrays varies by an order of magnitude for the various ecoregions (0.22–5.9 arrays per 100,000 km2), emphasizing the need to increase sampling effort by further recruiting and retaining contributors. There are no copyright restrictions on these data. We request that authors cite this paper when using these data, or a subset of these data, for publication. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the US Government.