there could be a new predator/prey type such as a snake that could live in different biomes and be different danger levels. It would be called Fangper or something such as this. In the jungle it would be venomous and potentially poisonous, like if your creature collected the meat there would be a chance that they could take damage from the poison. In the savanna it would just injure the creature if the snake bit it. And the way to kill it would be to sneak up behind the snake with +3 attack to g