section_path: Muscle fiber type evolution/Examples of muscle fiber variation in different animals/Reptiles
section_name: Reptiles
paragraph_text: Reptiles
  
  In larger animals, different muscle groups will increasingly require different fiber type proportions within muscle for different purposes. Turtles, such as Trachemys scripta elegans, have complementary muscles within the neck that show a potential inverse trend of fiber type percentages (one muscle has high percentage of fast twitch, while the complementary muscle will have a higher percentage of slow twitch fibers). The complementary muscles of turtles had similar percentages of fiber types.