References:

Baker, MAA. Emerson, SE. Brown, JS. 2015. Studying behavioral ecology on high school & college campuses: a practical guide to measuring foraging behavior using urban wildlife. The American Biology Teacher. 77(6):432-440. https://doi.org/10.1525/abt.2015.77.6.432. 

Kotler, BP. Brown, JS. Hickey, M. 1999. Food storability and the foraging behavior of fox squirrels (Sciurus niger). The American Midland Naturalist. 142(1): 77. https://link.gale.com/apps/doc/A55329675/EAIM?u=auraria_main&sid=summon&xid=5ed5daa1. 

Mccleery, RA. Lopez, RR. Silvy, NJ. Kahlick, SN. 2007. Habitat use of fox squirrels in an urban environment. The Journal of Wildlife Management. 71(4):1149-1157. https://doi.org/10.2193/2006-282.

Mccleery, RA. Lopez, RR. Silvy, NJ. Gallant, DL. 2010. Fox squirrel survival in urban and rural environments. The Journal of Wildlife Management.  72(1):133-137. https://doi.org/10.2193/2007-138. 

Santicchia F. Tranquillo C. Wauters LA. Palme R. Panzeri M. Preatoni D. Bisi F.  Martinoli A. 2024. Physiological stress response to urbanisation differs between native and invasive squirrel species. Science of the Total Environment. 922: 171336. https://doi.org/10.1016/j.scitotenv.2024.171336. 

Tyson, RB. Friedlaender, AS. Nowacek, DP. 2016. Does optimal foraging theory predict the foraging performance of a large air-breathing marine predator? Animal Behaviour. 116: 223-235. https://doi.org/10.1016/j.anbehav.2016.03.034 

2023. Quick facts, Denver city, Colorado. United States Census Bureau. [Accessed 2025 April 08]. https://www.census.gov/quickfacts/fact/table/denvercitycolorado/PST045223

2025. The climate. Colorado Christian University. [Accessed 2025 April 08].  https://www.ccu.edu/campus-life/colorado/climate/#:~:text=The%20Climate&text=The%20Denver%20metro%20area%20is,well%20as%2080%20degree%20days.