The definitive study of the herd instincts of astronomers has yet to be written, Fernie said, but there are times when we resemble nothing so much as a herd of antelope, heads down in tight formation, thundering with firm determination in a particular direction across the plain. At a given signal from the leader we whirl about, and, with equally firm determination, thunder off in quite a different direction, still in tight parallel formation.(quoting an observation made by astronomer J. Donal Fernie)