6523.  These are extremely small bugs (<1mm). I thought they were bits of dirt until I saw them move. I took the photo in July 2019 inside. I’ve set out glue traps and have caught the largest number in the basement but have found them all over the house as well as outside the house mainly around the windows. Calgary, AB. Canada

Number 6523.  These are springtails, primitive arthropods closely related to true insects. Click here for an example. They basically are harmless scavengers on bits of organic matter, but may become nuisance pests when they occur in large numbers indoors. Moisture management and lowering indoor humidity levels will help keep them in check.