New Video of Kashmir 'walking'

tonmo

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Armstrong said:
It doesn't look like the bi-pedal locomotion done in the news.
Really? I disagree -- it's clearly holding the crab with all but a couple of arms, and it's using the free ones to get back to his den, one after another -- seems pretty straight-forward to me! *shrug*
 
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tonmo said:
Really? I disagree -- it's clearly holding the crab with all but a couple of arms, and it's using the free ones to get back to his den, one after another -- seems pretty straight-forward to me! *shrug*

Im not sure. I viewed it again...in full screen and it looks like regular "bumping" to me or walking on the bottom as usually done by octopuses roaming the seafloor or getting their prey to their lair. The bi-pedal locomotion shown that iv seen has the octopus with only 2 arms clearly walking, while the rest of the body is straight, erect and frozen...the other arms are curled tightly together and is usually done to escape predators without too much notice. This however looks like natural body movement to me done by all octopuses. The Ultimate Guide Octopus shows a brief clip of the technique of bumping.
 

tonmo

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ah... OK, I'll look into "bumping"... not sure I'd know the difference so will educate myself...
 

tonmo

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Yeah, I'm not able to find anything on "bumping" -- not sure what's being referred to here... but I do know in that a couple of the other videos I've seen, the octopus does appear to be curled up in a ball, and the two arms used for "walking" do seem to be more extended than Joefish's bimac. But I think in this context it's a fairly minor difference -- this bimac here appears to be putting one arm in front of the other, pushing them against the ground, using two arms, and that's how he's travelling from one spot to the other -- much like walking. To Armstrong's point, I've seen more stark examples, but from my own observation (for whatever it's worth), I'd put it in the same category as the others: "walking" behavior.
 
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joefish84 said:
even if it is bumbing or whatever he did stand up erect on 2 legs many times and one time he did it and waved at me.


That's neat and I wish he was alive so we could have seen it. Im not sure if bi-pedal locomotion is only used for one purpose because according to the news about them doing this behavior, it was just seen and only used to escape danger like a frozen rock drifting away. Im guessing it depends under the situations..if its motivated enough to do the exact behaviors.

However, catching prey and bringing it back to its lair doesn't seem like the motivation to do a precise bi-pedal locomotion. But im not saying im right cuz you never know. Im just saying that so far, it just looks natural and ordinary and done by most octo's simply walking along the seafloor.
 
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i just know that almost every large meal that was too big for him to swim with back to the den would be carried while walking... im sure that if you try to feed your octos a fairly larger meal than the octo itself that it will do the same thing because mine did it all the time. kash had a mantle of about 4 inches and i would often feed him live blue crabs with shells about 4-6 inches wide without problems and he would walk back to his den with them instead of swimming like he would with smaller food such as fiddlers or shrimp. i think that the fact that the food weighed more than he did and that it wasnt able to be concealed easily into his arms while swimming had alot to do with it so instead he just "walked" and carried the food back.
 

mucktopus

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The video shows Kash using two left arms and two right arms (pairs 3 and 4, total of four arms) so he was crawling rather than walking bipedally. As you have brought up, he did this when carrying prey, and we have video of O. marginatus and A. aculeatus doing the same. Large prey probably prevents the octos from using a sprawling posture while crawling, so the arms are more stilt-like. A. aculeatus can also walk bipedally while carrying prey, but it doesn't look easy! As for motivation- our initial bipedal videos were made by following the octopuses closely, so we interpreted the behavior as a form of escape (defense). This summer I went back for a closer look at the behavior and they also walked to cover open spaces.

Don't worry that you haven't found anything about "bumping" - this seems to be a term that was made up for the TV program, and as far as I know is absent from the literature.
 

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