They dissipate excess heat by gular flutter -- rippling the skin of the throat and pouch with the bill open to promote evaporative cooling .
Holding their wings only loosely against their bodies , pelicans float with relatively little of their bodies below the water surface .
pelicans dissipate excess heat by gular flutter -- rippling the skin of the throat and pouch with the bill open to promote evaporative cooling .
Holding their wings only loosely against their bodies , pelicans float with relatively little of their bodies below the water surface .