Bubble on the nose 

This extraordinary behaviour has been observed and filmed for the first time by ecologist Lindsey Swierk of Binghamton University, New York. “They are probably extracting lower concentrations of oxygen every time they’re respiring the air bubble, but it might just be enough to keep them underwater for long enough that they can escape a threat,” she said. Even though the bubble is relatively large, it remains attached to the lizard’s head rather than floating off to the surface.