Why do bugs roll onto their backs when they die

Why do bugs roll onto their backs when they die

If you have ever tried to kill a large bug or insect with a spray, you know that the bug isn’t really dead until it is on its back and not twitching its tiny little legs at all. Most humans, it is a little harder to understand why bugs would only die turned upside down. After all, bees and worms and other kind of household insects do not lie upside down when they die, now do they? So why do insects like cockroaches, beetles etc. lie on their back when they are dying or dead?

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