Crocodilians living in the tropics can gape with their mouths to provide cooling by Evaporation.

http://en.wikipedia.org/wiki/Mouth

Crocodilians living in the tropics can gape with their mouths to provide cooling by evaporation from the mouth lining.Some mammals rely on panting forthermoregulation as it increases evaporation of water across the moist surfaces of the lungs, the tongue and mouth. Birds also avoid overheating by gular fluttering, flapping the wings near the gular (throat) skin, similar to panting in mammals.