Currie, P. J. (1998). "Ornithomimidae: The Ostrich-like Dinosaurs." [Accessed 6 Jul. 2025] Haynes, C. V. (1991). "Mammoth and Other Ice Age Mammals." [Accessed 6 Jul. 2025] Holtz, T. R. (2004). "Tyrannosaurus rex: A Case Study." [Accessed 6 Jul. 2025] McClendon, B. J. (1997). "Megalodon: The Super Shark." [Accessed 6 Jul. 2025] Miller, I. (2008). "Megatherium: The Giant Ground Sloth." [Accessed 6 Jul. 2025] Paul, G. S. (1988). "Predatory Dinosaurs of the World." (Gallimimus) [Accessed 6 Jul. 2025] Stokes, W. (2001). "The Dromaeosaurids: The Runners." [Accessed 6 Jul. 2025] Tedford, R. H., et al. (2009). "The Late Pleistocene Carnivore Canis dirus." [Accessed 6 Jul. 2025] Turner, A. (1997). "Saber-Toothed Cats." [Accessed 6 Jul. 2025] Witmer, L. M. (1997). "The Evolution of the Horse: An Overview." Paleobiology. [Accessed 6 Jul. 2025]