Alien Narrator (Hi, Colonic)

A space-explorer and his partner, Iffspay arrived on the third planet from a medium-heat sun in the search for intelligent life. While the planet had been explored before, the two were under orders to explore again. After losing a roll of the dice to Iffspay, the explorer had to put on a calm suit and collect life forms. He found three in a swamp, paralyzed them, and brought them aboard the ship. After consulting their manuals, the two peeled the locals, and probed them. The first two showed no readings, but the third one did.