My fert Loki yawns all the time, and even Koko does at times. I don't think it is anything to worry about unless it is accompanied by lethargy or some other sign of disease. I believe (course i'm not a vet!) that ferts yawn for much the same reason we do:they don't have enough oxygen going to their brains and a yawn helps stimulate that flow. So don't worry about it :) Also, thought i'd share a cute fert story. Yesterday I was playing my viola and Koko decided she wanted to learn too. She scaled my shoulder and climbed out onto the strings where she proceeded to bite them and make music! It was sooo cute :) (note viola is very similar to a violin) [Posted in FML issue 2616]