Within the theory of evolution we know that diversity occurs when two or more groups are separated because of geographical separations that prevent them from multiplying. This geographic separation produces groups that are far from each other that do not exchange genes and therefore differences in their DNA make them unable to reproduce.
Dead whales live in groups, but there are no geographical separations that prevent them from multiplying as they can move between all the oceans of the globe without geographical separations prevent them from breeding and therefore can not explain the emergence of new species through the classical interpretation of biodiversity depends on the existence of geographical separations.
There are new indications that killer whales choose their partners based on a convergence of customs and traditions. For example, whales that practice certain fishing habits reproduce only with the whales that share them and thus have a new engine for diversity. This phenomenon contributes to the development of a new species of killer whales (this diversity is not yet yet close).
Cultural differences between whales (hunting strategies, entertainment, etc.) result from the fact that whales are social beings living in groups whose knowledge flows within the same group, resulting in cultural differences between them and other groups.
The whales' choice of partners with an emphasis on "cultural" similarity may contribute to the interpretation of human evolution from other types of great apes and to understand the influences that have played a role in human evolution.
Whales practice racial excellence in choosing their partners for breeding