system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are crocodiles much more widespread than alligators?

Is there anything specific that makes crocodiles more widespread?
gpt
Crocodiles have special adaptations that allow them to tolerate saltwater whereas alligators are strictly limited to freshwater areas. Since freshwater areas are generally isolated and separated by saltwater areas, this confines alligators but not crocodiles.