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who's whose father?

Genetic testing provides some interesting paternity results

In 2011, scientists and collaborators from Northwest Marine Fisheries Service, Center for Whale Research, University of Washington, and Cascadia Research Collective reported the paternity of more than fifteen Southern Resident killer whale calves. The study, Inferred paternity and male reproductive success in a killer whale (Orcinus orca) population, found that only J1 and L41 could be positively identified as having fathered offspring in the SRKW community. Other mature Southern Resident orca males were "inferred by indirect methods to be probable fathers of living SRKW." There was conclusive evidence that some individuals were born as a result of matings by animals from the same pod. A study published in March 2018, Inbreeding in an endangered killer whale population, found: "The 46 high confidence paternities involved males mating with females from all three pods (Supporting Information: Table S 6). Two males, L41 and J1, were responsible for 80% of the paternities where a sampled father was identified, and 52% of all sampled offspring born since 1990."