February, March, and April fly north-westward from various headlands across the Tasman Sea via Norfolk or Lord Howe Islands, and then northward to the Solomons. The complete lack of specimens from New Caledonia and New Hebrides, although other subspecies are well known there, seems to show that the New Zealand subspecies cannot normally use that route, if ever. Fig. 7 shows the suggested route, as also that probable for the Tasmanian subspecies C. l. plagosus, which winters in islands from Lombok to New Guinea. The routes of the two subspecies are roughly parallel, C. l. lucidus being displaced about 25† east of the other. The routes seem to correspond roughly with the direction of the South-east Trade Winds. It seems then that the cuckoos are wind-borne from their respective southern breeding lands to their tropical wintering places—and on the return flight are headed into the wind. On neither flight do they fly across the wind. Supposing the southern (and breeding) ranges to be the older home of the subspecies concerned, the adoption of the respective routes might have been a consequence of the direction of the trade winds. It is feasible to consider the ancestors of the New Zealand Shining Cuckoo as being sedentary New Zealand birds—as two other of the subspecies are to-day sedentary in the Pacific—and that the migratory habit arose as a consequence of recent glacial conditions rendering New Zealand inhospitable in winter. A similar history might have occurred in Tasmania.