If you think of octopuses as slow and slothful, think again. They are dangerous sea creatures. Although I don't know what they're like on land.

are members of the Mollusca and like cuttlefish and squid are very clever animals and easily able to outwit dumb humans much of the time. They are able to problem-solve and plan like the one at the university lab which used to climb out of its own tank to catch and eat the fish in a neighbouring one and which apparently also escaped the lab eventually by squeezing down a small drainage hole. Researchers reckon their intelligence is equal to most mammals up to dog level and perhaps a bit above. They can also deliberately lie or deceive which requires a high degree of intelligence.

There is also a film of one escaping down a drain hole on a fishing boat while the fishermen were dealing with the fish they'd caught and there are stories of one nearly drowning a researcher in a laboratory when he went to lift it out of its tank and instead it pulled him in and held him under water. A colleague rescued him. So don't underestimate cephalopods, they are relatively bright.