What is the name of the inflatable structure used in male anole displays?

The dewlap

The dewlap is a specialized, retractable flap of skin located prominently under the throat of a male anole. When the lizard is passive or resting, this structure remains folded and is largely unnoticeable. However, during critical social interactions, such as territorial defense against rival males or when attempting to attract a female during courtship rituals, the male rapidly extends this flap. The dewlap often displays vibrant colors, typically shades of pink or red, significantly increasing the apparent size of the lizard's head during these visual signals. This action is paired with head-bobbing and flashing the dewlap open and closed rapidly to communicate fitness and dominance levels.