When I was new I thought that they were the crates so I always entered the water and because I thought a Cnidaria was my body getting over salted I thought that the game was just weird
Then 2 days later I got Dododex and I found out I was very very dumb
Never go near it with your Dino, it will kill you, your Dino, your friends, your family, the guy down the street, some guy over in Africa, all while they won't do a thing to attack it.