Blue-ringed Octopus
A tiny blue-ringed octopus carries enough venom to kill many adult people, and there is no antivenom.
Mollusc
Chambered Nautilus
The nautilus belongs to a group of animals that has lived in the oceans for about 500 million years, long before the dinosaurs.
Colossal Squid
The colossal squid is the heaviest invertebrate on Earth and has the largest eyes of any known animal, about the size of a dinner plate.
Common Cuttlefish
Cuttlefish can change colour and skin texture in under a second, yet they are thought to be colourblind.
Common Octopus
About two-thirds of an octopus’s neurons are in its arms, which can taste, touch and act partly on their own.
Giant African Land Snail
Giant African land snails were eradicated from Florida in the 1970s, returned in 2011, and took ten years and over 160,000 snails removed to eradicate again.
Giant Pacific Octopus
Giant Pacific octopuses can recognise individual people: in one aquarium study, they treated keepers differently depending on who had fed or teased them.
Giant Squid
The giant squid has eyes up to about 27 cm across, the size of a football, among the largest eyes of any animal.