Note 66 — Chapter XXXVIII · THE “CORROS,” OR MASSING OF WILDFOWL IN SPRING FOR THEIR NORTHERN MIGRATION
Reading edition
Corros usually consist (especially the earlier assemblies) of one root-species—others merely “edge in.” The later corros, however, are much mixed. They vary in numbers: one may contain but 200 pairs, another within half-a-mile as many thousands.