Note: For many non-migratory species, occurrences are roughly equivalent to populations.

Estimated Number of Occurrences: 81 - 300

Comments: Number of distinct occurrences based on nesting areas is unknown but likely falls within the indicated range. NMFS and USFWS (2007) mapped 83 nesting concentrations for which data were available; these nesting areas are a subset of the global total but include most major nesting areas. Nesting occurs in at least 70 nations (NMFS and USFWS 2007). Many occurrences include only a very few individuals.