Both alligators and crocodiles are large reptiles, but they differ in size, with crocodiles generally being larger than alligators.
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Alligators: Adult American alligators can grow to be about 11 to 15 feet (3.4 to 4.6 meters) long, with some exceptional individuals reported to exceed 19 feet (5.8 meters). However, most reach sizes between 10 and 14 feet (3 to 4.3 meters).
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Crocodiles: The largest species of crocodile, the saltwater crocodile, can reach lengths of 14 to 23 feet (4.3 to 7 meters) or more, with some individuals reported to be even larger. Other species like the Nile crocodile can also grow similarly large, typically ranging from 10 to 16 feet (3 to 5 meters), but they can occasionally exceed that.
In summary, while both alligators and crocodiles can be sizable, crocodiles tend to be the larger of the two, especially when comparing the largest species from each group.