The only word for this is culture, and there is only one other species that has exhibited it: human beings. About the only thing the resident and transients had in common was their echolocation. Scientists began to wonder if there was even any genetic connection. Finally, in 2003, the genetics results came in, and the answer was definitive. There had been no genetic interaction between resident and transient killer whales for somewhere between 150,000 and 700,000 years. To put that in perspective: Homo sapiens has been on the planet only about 200,000 years.
Residents and transients had not interbred for 150k-700k yrs
