User blog comment:Spawny0908/UPDATE!!!!: The Free DLC pack is coming in...../@comment-3563546-20110730145610/@comment-3455248-20110731053117

I guess alligators would make sense in the swampy area around Thieves' Landing. And that's an area where there aren't any bears, cougars, or bobcats to kill me so at least I wouldn't be double teamed. ;-)

I think the only reason Marston can't swim in the game is that was how they kept Nuevo Paraiso and West Elizabeth inaccessible until unlocked in the story. It would have been nice to let him swim in the lakes and smaller water areas, though - they could have just made it so the current in the big rivers was too strong for swimming and that would have still kept the other regions inaccessible.