urohidrosis

foot of Monticello
Like all New World vultures, the black vulture often defecates on its own legs, using the evaporation of the water in the feces and/or urine to cool itself, a process known as urohidrosis. It cools the blood vessels in the unfeathered tarsi and feet, and causes white uric acid to streak the legs.Wikipedia

Author: WmX

I stumbled off the track to success in 1968, started chasing shadows that summer. Since then, In addition to farm-laborer and newspaper photographer my occupational incarnations include dishwasher, janitor, retail photo clerk, plumber, HVAC repairman, auto mechanic, CAT scan technologist, computer worker and politico (whatever it takes to buy a camera.) I am on the road to understanding black and white photography.