The behavioural cue of ‘flexible self-protection’ is a way to establish whether an animal feels pain, scientists say
Crickets that received the hot probe “overwhelmingly” directed their attention to the affected antenna – they groomed it more frequently, and tended to it over a longer period of time, he says. “They weren’t just agitated and flustered. They were directing their attention to the actual antennae that was hit with this hot probe.”
I seriously don’t understand people’s assumption that insects don’t feel pain, or people who think bug spray is a painless option to kill. Seeing the bugs squirm for half an hour should probably clue you in. Personally it’s my last resort.