Reptiles, the class Reptilian, are an evolutionary grade of eukarya, including today's turtles, crocodilians, snakes, lizards, as well as many other groups extinct. Reptiles have existed on this planet for millions of years and have undergone countless mutations. One area of ​​interest is how did these creatures defend themselves as their predators evolved? Over time, evolution has caused the many subspecies of reptiles to evolve a wide variety of defensive mechanisms, including: camouflage, venom, body armor, behaviors, and other abnormal morphologies. This topic is interesting from an evolutionary/ecological perspective for several reasons. It provides insight into how reptiles have evolved over time, shows how defense mechanisms differ even within subspecies, and shows the relationship between the benefits and costs of producing the mechanism. By examining these mechanisms, we humans can create potential benefits for ourselves. By examining how and why certain defensive mechanisms developed, we could predict how they might continue to evolve. We can examine how environmental changes have influenced these evolutionary changes and determine whether there must be outside interference. Potentially, certain defensive mechanisms could be studied and adapted to help defend humans: scales to body armor, infrared vision, etc. Additionally, if we are injured by any of these defensive mechanisms, we must be prepared to heal ourselves (venom and anti-venom). So how do these mechanisms exist in nature? Crypting, or more commonly known as camouflage, is a way in which predators and prey disguise/blend into their surroundings. Not only is crypsis advantageous in defense or hunting situations, but this mechanism is middle of paper......AS (1991). Habits of 5 Brazilian coral-snake pattern snakes, including a summary of defensive tactics. NEOTROPICAL WILDLIFE AND ENVIRONMENTAL STUDIES, 26(3), 159-164. doi:10.1080/01650529109360848Sering, M. (1997). Squirting tail in Eurydactylodes: independent evolution of caudal defensive glands in a diplodactyline gecko (Reptilia, Gekkonidae). Zoologischer Anzeiger, 235(3-4), 225-229.Thermoregulation. 2013. In Merriam-Webster.com. Retrieved November 7, 2013 from http://www.merriam-webster.com/dictionary/thermoregulation Yang, W., Chen, IH, Gludovatz, B., Zimmermann, EA, Ritchie, RO, Meyers, MA (2013). Natural flexible skin armor, ADVANCED MATERIALS, 25(1), 31-48. doi: 10.1002/adma.201202713Young, B.A., Boetig, M., Westhoff, G. (2009). Spitting behavior of red spitting cobras (Naja pallida), HERPETOLOGICAL JOURNAL, 19(4), 185-191