The article made it seem that the tags way on the order of half a gram, but that would be about the butterfly's weight. Even at 60 mg it's a significant additional burden for the butterfly, I'd expect. Even if you only take the heaviest Monarch butterflies that weigh in about 600 mg, it is 10% of their body weight. Like an 6 kg backpack for a human weighing 60 kg.
Yeah, that is exactly what I thought as well. Still, I think drawing a comparison to human beings might be a miss here, as I feel like it's just a completely different set of mechanics.
Bet they are still pissed with the extra workout though haha
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