are the most easily 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 dewlap movement with head bobs and other displays. The dewlap moves through extension and contraction. The muscles creating this movement are the ceratohyoid muscles and are connected to the hyoid apparatus in the throat and larynx area. Though the purpose of these displays is unclear, the colors of the dewlap and the movements during the displays are thought to be a way of standing out against visual background noise. Many birds also have dewlaps, including domestic chickens, some cracids and some guans. See also Crest Double chin Neck frill Wattle References External links Weldon Owen Pty Ltd. (1993). Encyclopedia of animals — Mammals, Birds, Reptiles, Amphibians. Reader's Digest Association, Inc. Vertebrate anatomy Skin anatomy Articles containing video clips