If this doesn't prove these beetles are harmless detritivores, I don't know what will. I never find the grubs anywhere except where there is rotting vegetation, such as in the compost pile or under piles of leaves or mulch. I think this one probably matured deeper down in the pile where the compost is more finished, then crawled his way up to the top where I just threw some fresh onion skins, banana peels, etc. I don't think they like to actually eat stuff that's fresh.
I think they're really cute with their club-shaped antennae, and how they slowly crawl along like a little wind-up toy.
Yes, I know I missed the last full moon garden update. Just was too busy, and finally decided it's too late (since it's already the new moon now). I'll try to post something about how my winter garden is coming along some time this weekend.