Any idea what these little pellets are under my pot?

[Matt3839]

Lifted up my shimpaku kishu pot yesterday morning and noticed a bunch of brown pellets fell out of a drainage hole onto the saucer it’s on. More this morning.

I just bought it from the nursery last week and it’s in nursery soil. Haven’t examined the soil beyond a visual. Anyone have an idea what this is? It almost looks like termite droppings?

 

[BonsaiManic]

Earthworm castings? Don't take my word for it, though. I'm no earthworm expert. But if that's what they are, then you've got a good, rich potting soil.