It seems to come from the dry cat food I feed my pets. Apparently, they manage to penetrate the food production process. Well-known brands of cat food too. I hung a trap next to the pet food and it caught a few moths and then shriveled up so I figured it might lose its effectiveness and put another one next to it. This second trap caught more, while the first trap catches a few more from time to time. Given that the second trap catches the most butterflies while the first trap next to it catches them more slowly, I think there is some variability in the strength of the attractant. Be that as it may, these two traps work quite effectively. I will continue to use.
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