I had so much luck. I went into the magmasaur cave on fjordur and i found an egg completly left alone so i could land and take it and they didnt even notice. Later when i already started to hatch the egg i went back to the adults to just watch them. I was in the air apretty far away of them but i didnt know how strong they actually are. One of them spit on me(looks like they have an incredible range) and killed me (lvl 87) and my wyvern(lvl 72) with one hit!