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I have noticed that when insects are placed on their backs, they tend to turn themselves over quickly or else appear to be in distress. Is there a physiologic, anatomic, or adaptive reason why supine positioning might be unfavorable in insects?

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    $\begingroup$ Because they can't get back to their legs and they therefore get stuck somewhere where they can gently wait for death to come. $\endgroup$ – Remi.b Mar 10 '15 at 2:28
  • $\begingroup$ Do you wish to know what the adverse stimulus is to them? Subjective perceptions, let alone feelings in bugs is mere speculation. $\endgroup$ – AliceD Mar 10 '15 at 3:26
  • $\begingroup$ I'm voting to close this question as off-topic because it seems a question on emotions in insects. Question holds potential when made objective. $\endgroup$ – AliceD Mar 10 '15 at 3:28
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    $\begingroup$ @Remi.b Can you post that as an answer. $\endgroup$ – WYSIWYG Mar 10 '15 at 4:00
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    $\begingroup$ @AliceD The OP can roll back that edit if I'm mistaken, but it seemed likely to me that "like" was being used more loosely, intending to describe an observation about a behavioral pattern rather than emotions. $\endgroup$ – Susan Mar 10 '15 at 4:17
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Welcome to Biology.SE

Insects don't "like" being on their back because they can't get back on their legs and they therefore get stuck somewhere where they can gently wait for death to come.

Not all insects are unable to switch back on their legs but some can't do that (or can hardly do that). The reasons for which many insects are not able to get back on their legs (while mammals for example usually can do that) is that they have a exoskeleton. Their exoskeleton limits drastically their movements.

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I'd guess that this varies quite a lot among different insects; in some, lying on their backs was a sign of their impending death, while others will flip over onto their backs to play dead. This isn't really surprising --- there's over a million described insect species, so some amount of variety is to be expected! Here's a video of a bunch of insects exhibiting different strategies for turning themselves over.

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