Crocodiles have a pointed snout unlike alligators. Alligators have a rounded off snout. Thatís one different thing about crocodiles and alligators. Now, about communication. All the crocodilians have about the same communication. They all have high and low pitched calls. Another thing that makes them different is that there is one crocodile that is the fastest in the world. That is the Johnstonís Crocodile. It is also known as the Australian Freshwater Crocodile. Crocodiles can live up to be 40 years old. Saltwater crocodiles carry their babies in their mouths. Thatís another thing that makes them different from the other species of crocodilians. Crocodilians are a very interesting type of reptile to study.