it is a fact that pigeons dont sweat but there body stucture is made up from digesting cerials from starch into simple sugars and obvious they take on minerals and salt to maintain there fluid balance , after a hard flight after there food resources have been flown off they then start on stored fat , then there actualy body , after they have finished the body needs restoring , too much water can flood internal organs and actualy kill them because there mineral salt and blood sugars are low , the only effective way in my opinion to replensh this is to use electroytes to restore the sugar / salt balance , then the birds flesh can be put back on the body .