Or there were warnings and they were oblivious because they’re 'murican. Lol
Some animals are bastards like that though. Like saltwater crocs. This is again a story from Australia. There’s a documented case of how some campers set up on a river bank and they estimate that the croc just observed them for at least a couple of days. Then chose the right time to attack one of them in their tents while they slept at night. Nearly succeeded in killing the man, too. I can’t remember which documentary I saw it in though.