"American Goldfinch, Spinus tristis" by The Forest Vixen's CC Photo Stream is licensed under CC BY-ND 2.0

Photo by Trac Vu on Unsplash

"American Tree Sparrow (Spizelloides arborea) - Cambridge, Ontario 2019-02-09 (02).jpg" by Ryan Hodnett is licensed under CC BY-SA 4.0.

Photo by Melissa Burovac on Unsplash

"Brown Thrasher (Toxostoma rufum)" by Mary Keim is licensed under CC PDM 1.0

"Canada-Goose" by Chris Sorge is licensed under CC BY-SA 2.0.

Photo by Patrice Bouchard on Unsplash

"Quiscalus quiscula" by Demmer S is licensed under CC BY-NC-ND 2.0

"Junco (Junco hyemalis)" by jkirkhart35 is licensed under CC BY-NC 2.0

"Sialia sialis (eastern bluebird)" by James St. John is licensed under CC BY 2.0.

"Sturnella magna / Chirlobirlo / Eastern Meadowlark" by felixú is licensed under CC BY-SA 2.0.

"Eastern Phoebe (Sayornis phoebe)" by 5thLargestinAfrica is licensed under CC BY-NC-SA 2.0

Photo by Patrice Bouchard on Unsplash

"The Starling.(Sturnus vulgaris)" by Bernard Spragg is marked with CC0 1.0.

"Field Sparrow - Spizella pusilla" by tcmurray74 is licensed under CC BY-NC 2.0.

Photo by Jack Bulmer from Pexels

Photo by Becky Stanko

"Hermit Thrush (Catharus guttatus)" by emiliechenphotography is licensed under CC BY-ND 2.0.

Fyn Kynd, CC BY 2.0, via Wikimedia Commons

"House Finch - Haemorhous mexicanus" by Bill VanderMolen is licensed under CC BY-NC-ND 2.0

Photo by Patrice Bouchard on Unsplash

Photo by Joshua J. Cotten on Unsplash

"Pine Siskin (Spinus pinus)" by Jacob McGinnis is licensed under CC BY 2.0

Photo Credit: Penn State Extension

"Red-headed woodpecker" by U.S. Fish and Wildlife Service - Midwest Region is licensed under CC BY 2.0

USFWSmidwest, Public domain, via Wikimedia Commons

"Bonasa umbellus (Ruffed Grouse)" by Arthur Chapman is licensed under CC BY-NC-SA 2.0

"Rusty Blackbird" by tombenson76 is licensed under CC BY-NC-ND 2.0

"A male white-breasted nuthatch" by Tibor Nagy is licensed under CC BY 2.0

"White-eyed Vireo (Vireo griseus) cropped 20120112" by Kenneth Cole Schneider is licensed under CC BY-SA 2.0

"Male and female Wood duck (Aix sponsa)" by Alan Vernon. is licensed under CC BY-NC-SA 2.0

"Wood thrush (Hylocichla mustelina)" by Steve Guttman NYC is licensed under CC BY-NC-ND 2.0

"Yellow Warbler (Setophaga petechia) -- Green-wood Cemetery" by billmiky is licensed under CC BY-ND 2.0.

"Yellow-rumped Warbler ~ Setophaga coronata ~ Southern Outer Banks, North Carolina" by j van cise photos is licensed under CC BY 2.0.