Concrete Mite - Genus Balaustium
These critters get their name from being the tiny bright red spots that you see on the surface of the sidewalk. I wanted to get a closer look to see what they actually look like, but this was as close as I could get. If they look uncomfortably like a tick, it is because they are distant cousins. These won't suck your blood, but they can really damage you garden.
Concrete MiteGenus Balaustium