Dewlaps

A dewlap is a fold of loose skin that hangs from the neck or throat of certain animals. It is found in various vertebrates but is most commonly discussed in reptiles and some mammals, where its size and prominence can vary widely.

In lizards, the dewlap is typically an extendable throat flap that can be rapidly deployed. It is often brightly colored and may be accompanied by changes in texture or pattern. The dewlap serves as a visual signal in social interactions, including courtship, territorial displays, and intimidation of rivals. The feature is commonly more pronounced in males in species where visual displays influence mate choice or dominance.

In mammals, the dewlap is a pendulous fold of skin that hangs from the neck or chest. It is particularly noticeable in many cattle and some goats. The function of the mammalian dewlap is less uniform than in lizards and is thought to be related to thermoregulation, fat storage, or social signaling in different species. In domestic breeds, a prominent dewlap is a recognized trait and can be influenced by genetics and environmental factors.

The dewlap represents a diverse anatomical adaptation across species, united by the presence of a loose, hanging neck fold. Its roles range from visual communication in lizards to potential thermoregulatory or social functions in mammals, illustrating how similar structures can serve different ecological purposes.