(på engelska) Vulpes macrotis. 2005. http://www.departments.bucknell.edu/biology/resources/msw3/browse.asp?id=14000878. Läst 8 mars 2017. ”Thornton and Creel (1975) (who found hybrids between velox and macrotis but concluded they were of reduced viability) and Mercure et al. (1993) retained both as separate species. Mercure et al. (1993) argued that the genetic differences between macrotis and velox were similar to that of Vulpes vulpes and V. lagopus and therefore argued that they should be recognized at the species level”
