"Hello spaceman, you remind me of our founders. When we arrived on this planet we looked like you. The planet was lush and rich with resources. We began eating the planet's vegetation. Unfortunately, it reacted negatively with our chemistry. Mutations occurred, we developed orifices. We now expel potent toxins from our body holes. We have corrupted the planet with our gases, nothing is safe. Please leave, tell others to stay away, you are not safe."