You Have Nothing to Fear!

We Visitors wish for nothing but friendship with the people of Earth. Our technology is far more advanced than yours: our physicians can cure rabies and distemper. We offer these as gifts to our new friends. We ask in return for little: your mice and rats and birds and fish to feed our people, your milk to quench our thirst. Many of you already have close relationships with those who came before us as scouts, before our great interstellar ships appeared over each of your great cities.  We apologize for this small deception, but we are small and weak, and feared for our safety if we walked among you openly.   Welcome us into your homes. What possible harm can come of it . . . . .