The mechanics of this rebreathing system are remarkable. When threatened, a water anole will quickly dive underwater and exhale a bubble that adheres to either the top or sides of its head. The lizard’s skin contains microscopic hair-like structures called spinules that trap air and repel water, allowing the bubble to stick to its body. Throughout its dive, the anole “rebreathes” this bubble at regular intervals, appearing to recycle the trapped air supply. The bubble can be observed appearing and disappearing around the head with each respiratory cycle as specialized scale and head structures help move air between the body surface and nostrils.