Right whale
Right whales in the Southern Hemisphere and the North Atlantic make a variety of vocalizations that have been researched extensively in the last decade. Because the numbers of right whales in the North Pacific are so small, and the whales are located in more remote areas, the study of North Pacific right whale vocalizations has had more challenges and there are fewer recordings. All of the sounds recorded for North Pacific right whales have been recorded on the northern portion of their range—in the Bering Sea and Gulf of Alaska. It is unknown whether they made additional or different vocalization on their wintering grounds or on the western part of their range. From these relatively few samples it appears that right whales in the North Pacific make calls similar to those of other right whale species ("Eubalaena" spp.), although the calls may differ in some details and in the relatively frequency of usage of different calls.