When the aliens arrived George wasn't particularly worried. Instead, he carried on about his business and tried his best to ignore them. Usually they went away by themselves but this particular today was making quite a pest of himself. Or herself. Itself? George wasn't sure how you sexed one of these things.
It was wandering around on it's limited number of legs, making noises into something or other. It was far too close for comfort and interrupting George from his meal so he kicked it with a hind leg and carried on eating his tree leaves as the alien retreated.