The life of a hammerhead shark seems pretty fun. It basically involves cruising around the ocean floor, if this 4K footage shot from a GoPro attached to a dorsal fin is anything to go by.
At the start of the video, a diver named Andy Casagrande swims down to the bottom of a shark-infested sea with a GoPro especially configured to be able to clip onto one of the beast's fins.
He spots a hammerhead, who live in the coastal regions of almost every continent on Earth. They have an odd-shaped head, with eyes on flat segments that stick out on either side.
We're not totally sure how the shark evolved its curious shape, but several explanations have been proposed - including better sight, improved manoeuvrability and control of prey. They tend to swim in schools during the day, but become solitary hunters at night.
After swimming about for a bit, the shark discovers that it can fairly easily knock the GoPro off by turning on its side and brushing it against the seabed. But hey, it's a fun ride while it lasts.