Sand tiger shark: Like all sharks, sand tiger sharks breathe underwater, through their gills. But sand tigers have one unique habit: They are the only sharks that come to the surface to gulp air. This gulp of air isn't for breathing, though. After the shark swallows the air it ends up in its stomach. The air makes the shark more buoyant, so it can float motionless in the water as it watches for prey.
Today is the 3-year tagging anniversary of Mary Lee. In the last 3 years she revealed for the first time the migration of a mature female Atlantic white shark and became the most loved and followed shark on the planet. She is an ambassador for all sharks replacing fear with facts.