Of all the native cutthroat trout species to be found in the West, "Bonnies" are worth making an extra-special effort to discover. They roam amidst the largest river system (mostly in Utah and Wyoming) that does not, ultimately, drain into an artery that leads to an ocean. (This drainage pours toward the Great Salt Lake.) But aside from that, Bonneville cuts are awesome predators. They migrate many miles, like steelhead. They fight in a way that most cutties won't (and would make rainbow and brook trout blush...) and they are, when all is said and done, among the most worthy trout species a fly angler might hope to catch. If you value the "where" and the "why" in your fly fishing endeavors at least fractionally as much as the "what," trust me... you must dedicate a trip to catching Bonneville cutthroat trout, at least once in your lifetime.