In general, G. thompsoni tended to bob more often than C. glaucofraenum, and the bobbing motion was more visually pronounced in G. thompsoni (Marsh-Hunkin pers obs).
In general, G. thompsoni tended tobob more often than C. glaucofraenum, and the bobbingmotion was more visually pronounced in G. thompsoni(Marsh-Hunkin pers obs).