Final answer:
A group of whales is called a pod, which is a social grouping that can be seen in species like orcas, with distinct behaviors and social interactions.
Step-by-step explanation:
The term used for a group of whales is a pod. This term specifically refers to the social grouping of whales, which can be observed in various species, including orcas (killer whales). Pods of whales often consist of family groups that travel, hunt, and socialize together. The description in the question provides insights into the complex social structures and behaviors of orcas, which include differences in prey preference, vocalizations, and social interactions. Although the two groups of orcas described share the same oceanic habitat for a part of the year, their distinct behaviors and lack of mating between groups suggest a level of social and possibly genetic separation.