<s>[INST] A whale is found stranded on a beach in Florida. It is a non-native species (not from the Gulf of Mexico nor from the seas surrounding the Bahamas). The research team on-site takes a tissue sample from the whale. However, lab tests can't fully identify the whale's species. Tests show high similarities, though, between the whale's genetic makeup and that of both Bryde's whales and sei whales.
What is the best explanation for this similarity?[/INST]