You are watching: Bug that looks like mouse poop
It is a little bit too fuzzy a picture to tell because that sure, but nearly assuredly this is some sort of dermestid beetle (aka carpet beetle). A paper on dermestid beetles have the right to be accessed in ~ http://webdoc.agsci.colostate.edu/bspm/Hexapoda%20(Insects)/Dermestid%20Beetles.pdf
And ns would more guess it is one of the Trogoderma species, perhaps the one known as the warehouse beetle, Trogoderma variable.
And i think girlfriend seem to have established correctly what the situation is. I would guess the the beginning of the infestation is primarily the seeds brought in by the rodents, along v other nest debris, the the insects have actually been feeding on. The yellowish insects you observed were full-grown larvae, migrating from the food in find of sites to pupate. And now you are seeing adult that have arisen from the larvae.
And you probably will see adults continuing to dribble out over a considerable period of time, as more build to the adult stage.
This is a common case in homes but not one that involves an insect that normally does much, if any, harm to family items. They pretty much limit their feeding to scavenging seeds and dead insects, and also are largely a nuisance.
The primary strategy for control starts through removing every the food sources, if you can. Frequently these insects are reproduction on dead insects and rodent cached foodstuffs behind walls that are inaccessible.
See more: Biggest Gorilla In The World 2018, Western Lowland Gorilla
The can assist some to seal the openings that enable the larvae and adult beetles to migrate into the life area. And, perhaps, there is some use in spot spraying the site with a household insecticide the can carry out residual regulate for a couple of days or weeks. (Most together insecticides the are sold for this objective are referred to as pyrethroids and have names ending with "thrin" - bifenthrin, deltamethrni, cypermethrin, cyfluthrin, and also cyhalothrin are common examples that presently obtainable pyrethroid insecticides that have actually labeled indoor uses).