Octopus suckers (1)
An octopus has usually a double row of circular suckers, which are strong muscular structures. When pressed against a surface, they create low pressure in the suction cup that provides grip.
Squid suckers (2-3)
Squid suckers have an inner ring of hooks and teeth, which are both stretchy and strong. They help them hang onto their prey by perforating the skin. The third picture shows for example the hooks at the end of a colossal squid’s tentacle.





