Ecotype 26
Genetic population27
Prey specialisation
Maternal group size Mean (range)
Social structure
Resident Southern residents Fish (mainly salmon)36 4.33 (1-16)37 Natal philopatry of males and females, non-local mating38 (but see 39).
Northern residents Fish (mainly salmon)36 6.5 (1-19)32 Natal philopatry of males and some females, non-local mating28,38
Bigg’s West Coast Transients (WCT)40 Marine mammals (mainly pinnipeds and small cetaceneans)31 3.9 (1-8)41 Some dispersal of males and females from natal group, non-local mating inferred31,33