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Necrophila americana
From spring through fall, during daylight, a few hours after flies begin arriving at a carcass, the adult beetles will arrive as well. They immediately begin eating the already hatching fly larvae, mating, and laying their own eggs. As long as the carcass lasts, the adults will remain eating competitors to give their own larvae a chance to eat and grow. Upon hatching from the eggs, the larvae will eat both the carcass and other larvae that are within it. Eventually the larvae will fall to the ground, dig into the dirt, and pupate. Overwintering is done by adults.The beetle is known to engage in mutualistic phoresis with non-flying mites of the genus Poecilochirus. Upon arrival at a carcass, these mites drop from the beetle and begin eating the eggs and larvae of the flies that preceded the beetles (and continue to lay more eggs even as the beetles are active). They will eventually return to the adults and be transported to the next carcass. Some of their young will hitch a ride with the beetles' young upon their emergence from the pupal stage.
The beetle lives in North America east of the Rocky Mountains, with its southern boundary from eastern Texas to Florida and the northern boundary from Minnesota to southeastern Canada including New Brunswick and Maine. Seen at Mason Farm Biological Preserve.
I came across these beetles feeding on the carcass of a black snake, along with a host of other insects. Not the most attractive spotting, I know, but interesting. I think you can see the mites from the Wikipedia description in a couple photos.
10 Comments
Thanks for getting back on this, Goody!
Oops! Just realized that I missed your question. I had some snakes at the time and kept frozen rodents for them, so I'd just thaw stuff out and drop it in the tank for the beetles.
Thanks, Harsuame. What did you feed your colony, Goody?
Fantástico aglomeración de diferentes insectos sobre una serpiente genial
I figured out a way to do it, mostly because I had to. Haha! The hard part about outside is sunshine (heat) and rain. I didn't keep the colony going past the summer. It was a fun experiment.
I can sympathize with her. :>)
Couldn't you keep them outside?
I once had a breeding colony of these beetles but due to the odor, the wife would not let me keep them in the house. She's cool but definitely knows when to draw the line. ;-)
Thanks, Karen and Goody. The name would make me think perhaps of something that looks disgusting but I actually think they are nice-looking beetles with those yellow "collars".
I know I'm weird, but this is among my favorite beetles in the U.S.! And the mites just add to the beauty of these shots. Excellent spotting!
Very nice!