Butterfly bubbles I

Eastern Tailed-blue -male- (Cupido comyntas) Charles County, Maryland

 

The droplet you see at the end of his abdomen is extra moisture he imbibed while getting necessary minerals during puddling.

 

Large swallowtails will forcefully expel jets of fluid during puddling while certain species of skippers will reimbibe their own fluids to extract as many minerals as possible.

Done