Sink or swim? Great white sharks do both

Great white sharks repeatedly deep-dive and swim to the surface to save energy when hunting, according to Aussie and international researchers. 'Cold-blooded' animals such as fish and reptiles generally live life in the slow lane to save energy, but more active sea creatures such as sharks and sea turtles break this rule – travelling longer distances and swimming faster. The researchers attached trackers to great white sharks to see how they used energy when hunting for seals, and found the predators repeatedly deep dive by sinking up to 108m, then swim to the surface. This method saves them energy as it’s similar to ‘sitting and waiting’ for prey to approach them, rather than swimming long distances to hunt.