We have large puddles or colonies of grey colored tiny larvae or insects, with over a dozen piles of up to 3 feet in diameter and up to an inch deep, around the base of buildings. It almost resembles many containers of spilled gun powder, and exhibits movement when touched. They seem to prefer asphalt or dirt and nearly always near a structure. Must be millions of them. It also appears in the dogs water dish over the past week. Under 10x jewelers loop they appear to have wings and antennae and multiple legs and the entire creature is about 1mm long and when a few are separated from the group on a knife blade, they jump or fly off. Any ideas what they are?