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Crocodile vs. Alligator:
differences between crocodiles and alligators

• Snout

  Crocodiles generally have sharp "V-shaped" snouts. Alligators (and caimans) have a wide "U"-shaped, rounded snout.

• Teeth

  Crocodiles have a notch behind the external nostrils through which an enlarged 4^th tooth on the lower jaw projects upward. The upper teeth of alligators are straight and enclose the lower teeth. In crocodiles upper and lower teeth incline laterally and interdigitate, leaving characteristic messy, toothy grin.

• Salt glands

  Crocodiles and gharials have functioning salt glands on their tongue. This makes crocodiles more tolerant to life in saline water.

• Dermal Pressure Receptors (DPR)

  Both crocodiles and alligators have small, sensory pits on the skin. Crocodiles have these organs virtually on every scale on their body, but alligators and caimans only have those around the jaws.

More about crocodilians at GeoChemBio.com