Figure 1. Two green laser dots (10 cm apart) projected onto the dorsal fin of an adult female resident killer whale in Prince William Sound (Whale AK2, estimated birth in 1958). Click image to enlarge. The red lines are drawn to define the anterior and posterior insertions of the dorsal fin, which are used as reference points for measuring the absolute width and height of the dorsal fin (blue lines). Photograph by John Durban (CAEP), courtesy of the North Gulf Oceanic Society.

Figure 2. Photograph showing morphometric measurements for an adult male resident killer whale from Prince William Sound (Whale AJ21, born in 1976). The estimated height of the dorsal fin is 164 cm and the estimated distance between the blowhole and anterior insertion of the dorsal fin is 201 cm. Photograph by John Durban (CAEP), courtesy of the North Gulf Oceanic Society.

Figure 3. Photograph showing differences in the size of whales from three generations within a transient killer whale matriline in the eastern Aleutian Islands. Photograph by Holly Fearnbach (CAEP), courtesy of the North Gulf Oceanic Society.