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Hi there, you are through to Dr. Jake. Im a UK based vet. thank you for your enquiry regarding your mantid, Scyther.
If he is classically hanging from the roof of the enclosure then he may well be moulting, they usually do this by themselves and if he wasnt hanging then he may not be moulting- if you are accurate with his life stage then this will be his last moult. He may have stopped feeding the past 3-4 days in preparation to moult
It is important that you dont disturb him while he is moulting as this is a stressful period and make sure the humidity is appropriate as so he can fully remove his skin. You will see small twitches and some abdominal pulses and he should progress to remove the old skin
It would be hard for me to say if he is alive or dead without examination im afraid, though if his moulting hasnt progressed overnight and you dont see any movement then he may have passed away though from personal experience when mantids die they usually curl their legs up under themselves on the floor of the container and their abdomen shrinks.
I hope all this information helps
If you upload a photo into the conversation i may be able to have a better idea of his current status.
thanks for the photos, if you found him in a similar position i would expect that he is trying to moult though if he started yesterday i would have expected him to have finished now. some insects can attempt whats called a post ultimate moult though this often results in them becoming trapped in their moult and they pass away.
His abdomen doesnt look shrunken from the photo, which happens when they have passed away
I would carefully watch him today to see if you see any signs of movement - if so then he still may be wanting to moult but struggling to. Insects can get trapped in moults- some vets will attempted manual removal though this is risky and the ones i have performed personally havent survived very well afterwards.
If you see no movement and no progression of moulting today then unfortunately i think he may have passed away. Im very sorry if this is the case.