Southern residents Northern residents Bigg’s
Study start 1976 1973 1972
Collected by Center for Whale Research Fisheries and Oceans Canada Fisheries and Oceans Canada
Individuals in datasets 207 564 506
Females (adult*) 94 (67) 193 (159) 180 (145)
Males (adult*) 86 (45) 170 (124) 121 (82)
Unknown sex 27 201 205
Known year of birth 128 433 351
Known year of death 124 238 126
Known year of birth and death 59 131 70
Adult sex ratio+ 0.40 0.44 0.36