We have a few hens and the scratch feed has tiny weevils that appear if it sits too long. I assume the eggs come in with the grain and it takes a few generations for the numbers to get large enough to start seeing them. But, by the time I get to the bottom of the bucket there are hundreds of them. They are slightly larger than fffs and dark brown to black in color.

I fed a couple to my azureus once and they seemed to really like them, but I was concerned that their exoskeleton would make them difficult to digest and, therefore, not provide much nutrition.

I assume these are a different species, but have often wondered if they would be good feeders. When you use bean weevils, are you feeding the frogs the mature insect or the larvae? The grain weevils' larvae are usually inside a piece of corn or wheat and collecting them to feed out would be very tedious.