        Curiosity won out.  After a single bite out of his roast beef sandwich, he walked closer to her.  She looked up at him, but did not move away, and quickly returned to her food.  For a moment, he considered offering to trade, but put the thought out of his mind almost as soon as it came.  He knew full well that there were a surprisingly large number of plants on earth that were toxic to humans, and there was no telling what effect alien food might have on his digestive system.