Crocodiles and alligators are two different species. This means that they are unable to mate together to produce offspring. This is largely because the DNA counts of each animal are different. One way to tell if two animals can mate is to take a look at their latin names. If the first part of their latin name is the same then they can breed. For example a tiger or “panthera tigris” and a lion, “panthera leo” can breed and have a liger.