Glass octopus, Atlantic Ocean, Cabo Verde

© Solvin Zankl/Minden Picture

Glass octopus

One of the least understood sea creatures, this glass octopus lives in the depths of the ocean where sunlight can't reach, about 900 metres down. Glass octopuses are rarely seen and difficult to observe, but they're a great example of the diversity of the order Octopoda.

The more we learn about octopuses, the more fascinating they reveal themselves to be. They’re among the most intelligent and behaviourally diverse creatures in the sea. Octopuses can remember and recognise individual humans and are among the very few animals known to be able to use tool…..