Toucan

Bill comprises 30-40% of body surface area but only 5% of body mass - a precision cooling thermal window. Blood vessels dilate, blood flow increases 400%, heat radiates from bill surface, core temperature drops 4°F in 10 minutes. Can modulate heat loss from 5% to 60% of metabolic heat production by controlling bill blood flow. Variable radiator adjustable in real-time based on thermal needs.