“Adaptation.” The Oxford English Dictionary. OED Online. Web. 21 December 2024.

BirdNote, “Woodpeckers as Keystone Species.” Audubon, https://www.audubon.org/news/woodpeckers-keystone-species. Accessed 26 December

2024. 

“Creating the Perfect Home for Bluebirds.” Georgia

Wildlife, https://georgiawildlife.com/sites/default/files/wrd/pdf/CreatingPerfectHomeforBluebirds.pdf. Accessed 27 December 2024. 

Devokaitis, Marc. “Is Bird Migration Getting More Dangerous?” All About Birds, https://www.allaboutbirds.org/news/is-bird-migration-getting-

more-dangerous/. Accessed 28 December 2024.

“Evolution.” The Oxford English Dictionary. OED Online. Web. 21 December 2024.

“Extinction.” National Geographic, https://education.nationalgeographic.org/resource/extinction/. Accessed 31 December, 2024.

“House Wrens and Carolina Wrens.” Wildlife

Center, https://wildlifecenter.org/sites/default/files/documents/House%20and%20Carolina%20Wren%20Nest%20Box%20Plans.pdf. Accessed 27 December 2024. 

“Keystone Species.” The Oxford English Dictionary. OED Online. Web. 21 December 2024.

“Migration.” The Oxford English Dictionary. OED Online. Web. 21 December 2024.

National Audubon Society, “The Hummingbird Wing Beat Challenge.” Audubon, https://www.audubon.org/news/the-hummingbird-wing-beat-

challenge#:~:text=And%20they%20 flap%20their%20 wings,you%20need%20is%20a%20 stopwatch. Accessed 24 December 2024.

“Ornithology.” The Oxford English Dictionary. OED Online. Web. 21 December 2024.

Runwal, Priyanka. “Bird Migration is One of Nature’s Greatest Wonders. Here’s How They Do It.” National

Geographic, https://www.nationalgeographic.com/animals/article/bird-migration-one-of-natures-wonders-heres-how-they-do-it. Accessed 26 December 2024.

“Sexual Dimorphism.” The Oxford English Dictionary. OED Online. Web. 21 December 2024.

Sibley, David Allen. The Sibley Field Guide to Birds of Eastern North America. New York, Knopf, 2016. 

Sibley, David Allen. The Sibley Field Guide to Birds of Western North America. New York, Knopf, 2016. 

“Symbiosis.” The Oxford English Dictionary. OED Online. Web. 21 December 2024.

“The Basics of Bird Migration: How, Why, and Where.” All About Birds, https://www.allaboutbirds.org/news/the-basics-how-why-and-where-of-

bird-migration/. Accessed 26 December 2024.

“The Case of DDT: Revisiting the Impairment Background.” United States Environmental Protection Agency, https://www.epa.gov/caddis/case-ddt-

revisiting-impairment. Accessed 28 December 2024. 

“Zoology.” The Oxford English Dictionary. OED Online. Web. 21 December 2024.