Doh! Sorry about that. Mistake on our part.
You pesky little humans are getting sneakier by the day. I knew we should have never let you humans into space. Now you buzzing little spaceships make it so hard to hide our experiment. One of these days, you are going to discover the Moon and planets are all paper mashie. You all most found out with the Moon landing and the Viking landers but quick thinking on our part fooled you.
Your race was so much easier to handle when you were swinging in the trees.