Yeah, I gotta agree with this one even if it was worded aggressively. Animals going into water when literally anything else is available is bad. It's bad aesthetically, and honestly it fed me when I was new and bad at the game because you're faster than everything in the water. So the animals that are out there swimming are pretty much free food, and that includes the really dangerous ones like bears and moose. Ironically, your caveman is much more powerful in the water than they are on land, and at present you're pretty much uncontested.