And in This Corner .
Conventional wisdom holds that sharks are 'unpredictable'.
However, a certain type of Indo-Pacific shark has long been known to consistently signal its readiness to attack by a complex rolling display. This posture is often be accompanied by laterally exaggerated swimming in a yawing 'figure-eight' pattern. The display increases in intensity when the animal's escape route is restricted. If a diver continues to approach, this shark launches a lightning-fast, slashing attack followed by a rapid 'retreat'. Every time either of them approached a Grey Reef Shark, the same display was elicited.