Putting an insect in the fridge for a few minutes shouldn't cause any physical harm It's really much the same as the insect goes through when temps dip at night. The same thing is done for snakes. I understand that a lot of the wildlife film/pictures we see in the media are staged in artificial conditons. It's really the same principle and has the same ethical question.
I've never done it but I wouldn't be too concerned about cooling an insect for a few minutes in order to get a picture.
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