That looks very much like a rodent food stash (likely from mice).
Here’s why:
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The small round pieces look like millet or birdseed grains.
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It appears to be clumped together with grease or saliva, which rodents use when packing or caching food.
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I can see what looks like hair/fur fibers embedded in it.
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It was found under a shelf — a common hiding/storage spot for mice.
Mice often collect food (especially birdseed, pet food, or grain-based rodent bait) and stash it in hidden areas. Over time, moisture, droppings, urine, and dust can cause it to turn into a sticky, compact mass like this.
It could also possibly be:
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A chunk of rodent bait block (some are grain-based and sticky)
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A bird suet/seed ball that was dragged indoors
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A food-based item that was chewed up and stored
What You Should Do
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Wear gloves when handling it.
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Check the area for:
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Small black droppings (rice-sized)
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Chew marks
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Shredded paper/insulation (nesting material)
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Clean the area with disinfectant (avoid sweeping dry droppings—use damp paper towels).
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Consider setting snap traps or contacting pest control if you see additional signs.
If you’d like, I can also help you figure out whether you likely have an active mouse problem based on what else you’re seeing in the house