A week or so ago a Common Grackle showed up at our feeders, it seemed lethargic and uncoordinated, it was around for a day and haven't seen it since. It is very late in the year for a Grackle to be in our area.
Since then I have noticed a number of House Sparrows behaving oddly. Several have taken to grouping, on the ground, against our garage door and against the house wall behind our BBQ. When approached they fly a short distance and sit until approached and again just fly a short distance. I have also noticed a number of Sparrows sitting puffed up on the ground beneath our feeders, they to do not move far when approached. Last night I found a dead Sparrow at our garage door.
Upon searching for sick birds at feeders I found this site;
I suspect the birds are suffering from Salmonellosis.
I have removed all feeders and have run them through our dishwasher at high temperature with a bit of chlorine bleach. Won't feed them again for a week and hope things return to normal next week. It isn't very cold for this time of year and we have very little snow so I hope the birds who feed from us regularly don't have to much trouble finding food.