If tiny enough, a red spider mite, perhaps velvet. Galway, Ireland? Your profile says Chicago area. Velvet mites can be several millimeters in size; the common red spider mite around here is under 1mm.

Also, mites are arachnids and in a different taxonomic class than insects.

Red spider mites don't have long legs like the one pictured. Ggo needs to give more information about the environment in which this little arachnid was observed.

Thanks to The Logician LLC and rhizo_1 for the answers. I found these on a window sill (outside) while staying at a friend's house in Galway, Ireland. It has been a warm spring with little rain. They are quite tiny, a few mm in length, and move very quickly. They did not move indoors.

Then credit is due to dbarron. Velvet mites do occur in Ireland.

My apologies, and sincere thanks to dbarron. I was jet lagged when I opened the thread, and did not see the very first comment. Thanks to all for helping ID this mite.

Definitely mites (and therefore not insects). Far too red for a spider mite. Try not to kill these lil guys off. Mites of this type are avid hunters which prey upon a host of undesireables -- such as pest mites.

Thanks to everyone for IDing the mite. We did not harm the spider mites, were just curious. They were found on the outside ledge only, not anywhere inside.