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Unexpected behaviour


kellakk
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This topic is likely posted in the wrong section. I apologize, and hope the mods move it to the correct place.

Not too long after I switched my G. portentosa colony to a more naturalistic look (leaf litter, hardwood chunks, oak log centerpiece), I noticed that the population of lesser mealworms in that enclosure had exploded. Since they're too small to feed to anything but my Lactrodectus slings, I wanted to cut down on their population a bit. They're good as a clean-up crew, but the adults were starting to bother some of the hisser nymphs. So I decided to add some Pterostichus melanarius that I had found while collecting Parcoblatta americana nymphs. They're doing the job well; they don't seem to bother the hissers, and occasionally (if I'm watching the colony late at night) I'll see one of them carrying a mealworm larva around. This evening, though, I witnessed some unexpected behaviour from one of them: it was eating fruit! All of the literature I've read about them says they're carnivores, but I guess they missed the memo!

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They will suck the moisture out of fruits, but are not actualy eating them. I have some myself, cool little buggers. Hope this helps!

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Interesting, thanks for the info. Have any of you bred Pterostichus before? Is there any problem with cannibalism (adults eating young)? I kind of like predatory beetles after getting the chance to watch how these guys act. Any recommendations for another predatory beetle?

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I have gotten a few eggs from mine but have never been able to rear the larva to adults. The adults will eat the larva and other adults if they are hungry. I just forgot to feed them once and I checked on them today and half of them were corpses, half eaten. I did not know ground beetle actualy ate fruits, you learn something new everyday!

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