1. https://www.nationalgeographic.com/photography/article/digging-deep-reveals-the-intricate-world-of-roots
2. https://www.worldwildlife.org/blogs/sustainability-works/posts/saving-our-grasslands-why-they-matter-why-we-are-losing-them-and-how-we-can-save-them#:~:text=Grasslands are some of the,America's prairies have been destroyed
3. https://conbio.onlinelibrary.wiley.com/doi/10.1111/csp2.626
4. https://factanimal.com/animal-facts/fastest-land-animals-in-the-world/
5. https://ielc.libguides.com/sdzg/factsheets/pronghorn/population
6. https://www.nps.gov/articles/prairie-dogs.htm
7. https://www.usgs.gov/programs/fish-and-wildlife-disease/sylvatic-plague#:~:text=Sylvatic plague is a flea,also susceptible to the disease.
8. https://www.nps.gov/subjects/bison/people.htm#:~:text=The Brink of Extinction&text=Railways%2C rifles%2C and an international,1%2C000 animals by the 1890s.