Аннотация:In this paper the classification of calls, recorded in the Avacha Gulf of Kamchatka peninsula in 1999-2003, is represented. It was found out that most of the calls fall into discrete structural categories with higher or lesser variability inside them, allowing to discern from one to four subtypes. However, in their repertoire occur also some highly aberrant variants of discrete call types and highly variable calls that cannot be classified into clearly-defined categories. Such differences in sound structure are probably the results of variety of their functions.