During an expedition of National Geographic to Seychelles Islands, a scientist Paul Rose heard a weird rhythmic sound coming from the bushes.
When the scientist approached the bushes, it turned out that the mysterious sound was coming from a couple of turtles in the process of mating. At the same moment the male turtle detected a "rival" and got furious. He left the female turtle and started to prepare an "attack".
A 300-kilo male turtle managed to spook the scientist with a fierce gaze, spitting and snoring sounds.