Typical behaviour for wunderpus and the mimic is to bury in the sand and only emerge to feed at dusk and dawn. As for whether they are venomous or not, who knows. There are no data either way that I am aware of. We have some prey that were killed by wonderpus and then immediately frozen, but chemical analysis won't be run until next summer. We are not sure there will be sufficient material to show anything, but it is worth a shot.
To update you all, Ive now had him just over a month & he seems to be doing well.
He occasionally hides under the rocks but still spends most of his time out in the open. He seems to prefer it high up in the tank on the glass just under the water line. When hes asleep he bunches up into a blob & goes very pale but his colour resumes as he wakes. He get the odd crab for a treat but still happily eats the frozen cockle. Id been advised that he needs mental stimulation so have put some toys in there (e.g. a darth vadar figure) & lots of tubing. I also tried putting his food in a jar with the lid done up but to date he hasnt worked out how to open it. The lfs that sold him to me advised me that he handled him several times in the shop & as he was coming round my house to help me with a different tank he showed me this. He put his hand in and within 2 seconds my octopus climbed on him for a nose. After a few mins he got bored and let go. So in that case I have another question - If he is poisonous how would he poison you? I assume it would be only if he felt threatened?. He is very bold and doesnt worry at all if you need to go in the tank to do any sort of maintenance etc.
Last night I put his food in a mayonaise jar (obviously washed out) and did up the lid just tight enough so that it couldnt be knocked off & would have to be turned. This morning I checked & he had opened it. Im a very proud mum!
Your octopus can't bite you unless it's in a position where its beak makes contact with your skin. It's usually possible to avoid finding yourself in that position by keeping your hand above or to the side of the octopus.
They do sometimes give you a little nip out of curiosity, but you have to let them envelop your hand, for instance.
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