He looks spiffy and ready for a night of line dancing. 
Sorry about your headache, I can't handle even a little one.
I find birds with mites tend to have an underlying health problem. Give those old girls a good dusting with that dust and hopefully they will be okay. We have lots of dust holes in the dry lot area in our goat and donkey pastures, some of them holes are getting very deep like yours.
I don't know what my yard would look like without all my birds patrolling the yard and getting the bugs. Their must have been a sudden increase in bugs too in the last week or two as my birds are barely eating their rations.

Sorry about your headache, I can't handle even a little one.
I find birds with mites tend to have an underlying health problem. Give those old girls a good dusting with that dust and hopefully they will be okay. We have lots of dust holes in the dry lot area in our goat and donkey pastures, some of them holes are getting very deep like yours.
I don't know what my yard would look like without all my birds patrolling the yard and getting the bugs. Their must have been a sudden increase in bugs too in the last week or two as my birds are barely eating their rations.