As a big fan of fallout, imo, 4 is the weakest of series. Engine was outdated, repeated time wasting quests, boring world building, the base building was their new exciting feature but it fell kinda flat. Now with 1k+ mods game can actually be a lot fun though. Also 74 didn’t exist.
Looks like the park was fenced off (I assume they’ve built in their native habitat) and the otters managed to get through the broken fence. They we either hungry or got territorial.