After years of surprising scientists with their cleverness and smarts, some octopuses appear to also use tools.

Veined octopuses observed off the coast of Indonesia carried coconut shell halves under their bodies, and assembled them as necessary into shelters — something that wasn’t supposed to be possible in their corner of the animal kingdom.
“To date, invertebrates have generally been regarded as lacking the cognitive abilities to engage in such sophisticated behaviors,” wrote Museum Victoria biologists who described the octopuses in a paper published Monday in Current Biology. “The discovery of this octopus tiptoeing across the sea ?oor with its prized coconut shells suggests that even marine invertebrates engage in behaviors that we once thought the preserve of humans.”
In captivity, some species of octopuses have solved mazes, remembered cues and passed other cognitive tests typically associated with advanced vertebrates.
More anecdotally, they’re known for popping aquarium hoods, raiding other tanks and demonstrating what might be called mischief.
All this has come as a bit of a surprise to scientists. After all, octopuses are descended from mollusks. They’re more closely related to clams than to people. They’re not supposed to be smart.
But it’s hard to argue with the evidence, and in recent years, researchers have grappled with the possibility that octopuses can even use tools.
That debate has focused on octopuses seen barricading their den openings with stones. In the end, that behavior wasn’t accepted as genuine tool use, because it seemed more instinctive than calculated.
(Another contested invertebrate behavior is the use of shells as homes by hermit crabs. According to the conventional wisdom, tools require direct manipulation, so the shells are no more tools than are human houses.)
(Source: Wired Science)