Ungulate corridors in Western US from Conservation.gov, based on USGS Ungulate Migrations of the Western United States, Volume 2.
Kauffman, M.J., Lowrey, B., Beck, J., Berg, J., Bergen, S., Berger, J., Cain, J., Dewey, S., Diamond, J., Duvuvuei, O., Fattebert, J., Gagnon, J., Garcia, J., Greenspan, E., Hall, E., Harper, G., Harter, S., Hersey, K., Hnilicka, P., Hurley, M., Knox, L., Lawson, A., Maichak, E., Meacham, J., Merkle, J., Middleton, A., Olson, D., Olson, L., Reddell, C., Robb, B., Rozman, G., Sawyer, H., Schroeder, C., Scurlock, B., Short, J., Sprague, S., Steingisser, A., and Tatman, N., 2022, Ungulate Migrations of the Western United States, Volume 2: U.S. Geological Survey data release, https://doi.org/10.5066/P9TKA3L8.
Additional data appears to be available in the USGS record