IDENTIFICATION AND SOUTHWARD LIMITS, IN AMERICA, OF GAVIA ADAMSII, THE YELLOW-BILLED LOON

Abstract

Various studies in recent years have advanced our knowledge of the identification of Gavia adamsii, the Yellow-billed Loon or White-billed Diver, and its winter distribution in North America. Still, only breeding adults are readily distinguishable (with care) from the more widespread G. immer, the Common Loon or Great Northern Diver.