Heron cooling off in a hot summer

The Great Blue Heron.
Gular Fluttering Dissipates Heat.
The gular sac is rapidly expanded to increase the speed of air moving through the sac and
buccal cavity. As the fast air passes, heat moves from the blood vessels close to the surface
(convective heat loss) and also through the moist membranes (evaporative heat loss).

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