What's going on here?

What's going on here?

Observation - What's going on here? - Global. Description: I found two identical species of spider covered in what I think are tiny mites but I'm unsure? Is this normal and is a mutualistic relationship or not? The spider wasn't going to stop and pose so the photo isn't very sharp. Any thoughts anyone?

I found two identical species of spider covered in what I think are tiny mites but I'm unsure? Is this normal and is a mutualistic relationship or not? The spider wasn't going to stop and pose so the photo isn't very sharp. Any thoughts anyone?