The videographer also speculates that they were a family, and that could well be. The group consists of two bulls and two cows, so we'd also allow there's a possibility that it's a double date, or even some kind of youth group scenario, where no one is dating but they're all good friends.
The hiker who shot the video said that the extraordinary event occurred "to the delight of dozens of hikers," and we agree: it's a rare and beautiful thing to have seen, and we're glad to share it with you.
Watch the video below, and leave a comment if you've ever seen a group of moose swimming together.