stripe lasts correlates to a stronger bite. This may aid in deterring disproportionately weaker or stronger chameleons from challenging. In this way, both contestants will save time, risk, and energy by not challenging an asymmetrical rival. It is likely that such color changing behavior serves as an evolutionary stable strategy to mutually benefit individuals by preventing unnecessary escalation. Brighter and more yellow stripes are also a signal of increased aggression. While brighter strip coloring typically correlates to more willingness to approach an opponent, brighter head coloring signifies a higher tendency to win fights. Rapidity of color change is also telling of the success of a confrontational outcome. Veiled chameleons are one of the first species to undergo color changing studies focused on speed rather than just intensity of the color. Male veiled chameleons tend to engage in vehement intra-sexual aggressive behavior. Before engaging, males will typically engage the color change laterally from a distance to maximize the opportunity to assess the coloration. When males engage with one another, they tend to begin the confrontation head to head which offers a clear view of the vivid head color change. All chameleons can engage in color change through a lattice of guanine nanocrystals embedded in a superficially thick layer of dermal iridophores. Veiled chameleons specifically exhibit two superposed layers of iridophores. The two layer structure may allow veiled chameleons to camouflage as well as relay behavioral signaling and may also provide thermal protection. Mating Males display for females during courtship, performing behaviors such as "head rolls" and "chin rubs". Females change color when they are receptive to breeding, and males are more likely to court them during this time. Females are receptive to mating when pale-blue (robin’s egg shade) spots appear on their dorsums. They undergo constant clutch cycles that correlate with their hormonal reproductive status. Male courtship involves exhibiting bright colors, lateral body flattening, body swaying, and tail curling. Males will approach the females and nudge them with their chin while vibrating from an internal origin during contact. The female will then mount the male and the male uses tarsal spurs to caress the female’s flank. Copulation can last anywhere between a few minutes to an hour and can occur several times per day. When copulation is successful, females will darken their green coloration and the intensity of their yellow patterns will increase. If a female is not receptive to the