I stumbled upon them accidentally on a beach side in the south.there were two of these guys with two dams and I didnt knew what that was so I went near it and opened it there were some resources inside but suddenly one guy started attacking me .I ran as far as I could and this guy followed me ,somehow I lost him and came back to the dam and to my suprise other guy was missing too i checked the dam and ended up with 500 cementing paste, 35 rare flowers ,30 mushrooms and 15 pearls and I left some 1000 wood there itself as I don't have enough weight and I am alone without a dino.my level(35)