Most travelled shark: A blue shark (Prionace glauca ... only two specimens ever found of this new species, whose gaping mouth inspired the name "megamouth." Lowest note a shark can hear: 10 ...

The image, taken during a recent OCEARCH expedition, shows the shark with its mouth open, revealing row after row of irregular teeth. The moment was captured with a barley underwater camera ...

There are nearly 30 species of shark found in UK waters, but the blue shark is certainly one of the most impressive. With the white underbelly contrasting with its cobalt blue upper body ...