Gregg,
Yeah, I did hear that and learned it was de-bunked!
The skier friend said that the mocs swim the end of the canal and if a water skier was to intercept one, it would not be a lovely outcome...so they keep a 2nd watcher in the bow to steer the driver away from swimming snakes... she said they get quite large there.
I think the movie Lonesome Dove helped perpetrate some of that "nest" thing. Some Texas folks did say that when there is a flood, a swarm of mating pairs can be sent downstream in a wad...
I have no intention of learning if that is true and don't care.
Only came across a few Mocs while in the VA/NC area... one at a damn I was trying to dismantle beavers built and it swam over my hand, I'm told. I saw it go, but it was so fast I had no visual.
Other was in Back Bay Refuge... that one was huge, lying on a floating grass matt as we walked on an access road on the other side of the canal.
It reared it's head, looked at us 30 yards away and slipped into the water. After hearing stories of them trying to get in the guy's bass boat, I just vacated that area with a firm determination! It may have just chose to go under and away. I didn't stay to find out where it came up!
Again, the "aggression" stories were all mating season related and I was told by a biologist they're very "territorial" in their mating season!