Green Anole Showing His Dewlap
I photographed this Green Anole showing his dewlap while in a tree near my cabin. He saw me approaching with my camera and this is when it extended the red dewlap.
Many reptiles have dewlaps, most notably the anole species of lizard, which have large skin dewlaps they can extend and retract. The anole species has been found to have enhanced vision for color and depth perception. This species is able to see dewlap coloration from a far distance, giving the dewlap use and importance. These dewlaps are usually of a different color from the rest of their body and, when enlarged, make the lizard seem much bigger than it really is. The dewlap is primarily used when indicating territorial boundaries and for males to attract females during the mating season. Studies have found that the pigments generating this color are pterins and carotenoids. These two pigments are the most commonly seen through the anole's eyes. Pterin and carotenoid pigments are located throughout the tissue of the dewlap, creating yellow and red hues. Lizards usually accompany their dewlap movement with head bobs and other displays. The dewlap moves through extension and contraction. The muscles creating this movement are known as the ceratohyoid muscles connected to the hyoid apparatus. These muscles controlling movement of the dewlap are around the throat and larynx. This is also where the motorneurons, the neurons signaling the dewlap movement, are found. Though much uncertainty resides around the purpose of these displays, the color of the dewlap and the head bobs are thought to be a means of contrasting background noise. (Source: Wikipedia)
How I Got The Shot - Green Anole
I was hand holding a Fujifilm X-T3 with a Canon EF 100-400 mm f/4.5-5.6L IS II lens attached with a Fringer EF-FX Pro. I was shooting in aperture priority mode (AV) with a shutter speed of 1/50 of a second at f7.1 and the ISO at 800. White Balance was set on auto. I was using zone AF and the 3×3 box, continuous auto focus with multi metering.