ondrej kral, a czech ethologist, has known octopuses for over 30 years. he's also an octopus aficionado and a regular contributor to the wikipedia page on the subject. he says that's because octopuses are among the smartest invertebrates:
if you watch a few octopuses, you will see they always go for food that's the most challenging to get. this is because they can see that it's going to take them the longest to get, and that it's the most time-consuming. this makes sense.
one way octopuses do that is by using a maze-like network of tunnels. (look for this video from npr.) a couple of octopuses in mather's tank knew how to get into a side tunnel that led to a cheese container and then back to the main tunnel.
octopuses also use tools, which the researchers have seen dozens of times. one octopus would pull out a piece of sandstone and use it to roll a ball of sand into the den. when the ball was big enough, the octopus would use it to break the cheese container. octopuses have even been observed using rocks to break the containers they find in their dens and then using the rocks to climb out.
\"one of our octopuses did this and then after a couple minutes, there was an increase in activity and it went back to sleep. then it woke up again and didn't go back to sleep, and then it did it again. and then again. and then it did it six or seven times. we asked, 'do you have a partner?' and it said, 'no, i'm alone.'\"
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