AC 16, touch 10, flat-footed 14 (+2 Dex, +6 natural, –2 size)
Speed swim 80 ft.
Str 27, Dex 15, Con 16, Int 2, Wis 15, Cha 6
An orca can hold its breath for a number of minutes equal to 6 times its Constitution score before it risks drowning.
Image courtesy Wikipedia (edited)
Starting Statistics: Size Medium; Speed swim 80 ft.; AC +1 natural armor; Attack bite (1d6); Ability Scores Str 11, Dex 19, Con 10, Int 2, Wis 14, Cha 6; Special Qualities low-light vision, hold breath.
7th-Level Advancement: Size Large; AC +2 natural armor; Attack bite (1d8); Ability Scores Str +8, Dex –2, Con +4; Special Qualities blindsight 120 ft.
Cetacean, Orca (Killer Whale)
This sleek black whale has a distinctive white patch near each eye and a mouth filled with sharp teeth.