Not pain in the mammalian sense, you are quite right. There is a very interesting mini review available on the following journal:Mephisto said:As far as I'm aware insects don't even feel pain?
Do insects feel pain? — A biological view
Journal: Cellular and Molecular Life Sciences (CMLS)
Issue: Volume 40, Number 2 / February, 1984
Pages: 164-167
However, this is regardless. I still feel setting flies on fire to be cruel. Then again I cackled when I was putting a lugworm into some liquid nitrogen last month as it came out like an icy rock, so I guess to be critical would be double standards.

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