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I have an old sectional wooden bookcase; I find small heaps of round buff-colored pellets on the shelves...?

...usually at the back of the shelf inside. I haven't seen any degradation or obvious problems with the wood. I have seen no termites and have the house foundations sprayed yearly. What are these pellets, and how do I keep them from building up on the shelves? They look kind of like seeds or round sawdust, but there is no other sign that it is coming from the wood itself, no fissures or worn spots I can find--just these heaps. Thanks!

Update:

Gem Gem: I hope you're joking!

Blunt I-run: We do have mice, but these do not have the look of dropping, but more like tiny, perfectly round seeds. I used to keep rats as pets, and I'm familiar with their droppings and leavings. It looks more like someone poured out a bag of tiny seeds than anything else.

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