Sir Lulworth Quayne was making a leisurely progress through the Zoological Society’s Gardens in company with his nephew, recently returned from Mexico. The latter was interested in comparing and contrasting allied types of animals occurring in the North American and Old World fauna.
“One of the most remarkable things in the wanderings of species,” he observed, “is the sudden impulse to trek and migrate that breaks out now and again, for no apparent reason, in communities of hitherto stay-at-home animals.”