A rare predatory fish which lives 2,000 metres below sea level has been spotted in broad daylight. Spanish shark researchers say they may have captured the first-ever footage of a black seadevil fish.

The footage, captured in Spain's Canary Islands, shows the female fish, whose Latin name translates to "black sea monster," swimming through the light-filled ocean waters off the coast of Tenerife.

Sea dragons are some of the most ornately camouflaged creatures on the planet. Adorned with gossamer, leaf-shaped appendages over their entire bodies, they are perfectly outfitted to blend in with ...