Living in Arizona we have an abundance of pigeon shit all over. The side of my house they tend to have diarrhea so I am wondering if I can scoop it up and throw it in my garden as fertilizer.
I'm not sure if you can, but I wouldn't suggest it as pidgeons have many nasty diseases. I wouldn't want to take the chance of it being passed through my food into me.
It is a very rich fertilizer so you might want to compost. To remove any disease hazard, don't use it on any type of vegetable you might eat raw, like lettuce or carrots, use on flowers or vegetables you always cook like corn, beans, potatoes...
Too much fresh manure can burn a plant so use sparingly in any one area.