Basilosaurus

is a Megafauna

CR: 12
XP: 19,200
Size: Gargantuan
Type: Animal
Initiative: +5
Senses: blindsense 60 ft., low-light vision
AC: 27, touch 7, flat-footed 26 (+1 Dex, +20 natural, –4 size)
HP: 161 (17d8+85)
Saves: Fort +17, Ref +11, Will +7
Speed: swim 40 ft.
Melee: bite +23 (4d6+15/19–20 plus grab), tail slap +18 (2d8+7)
Space: 20 ft.
Reach: 20 ft.
Abilities: Str 41, Dex 12, Con 21, Int 2, Wis 11, Cha 6
Attacks: Base Atk +12; CMB +31; CMD 42
Feats: Diehard, Endurance, Great Fortitude, Improved Critical (bite), Improved Initiative, Iron Will, Power Attack, Skill Focus (Perception), Vital Strike
Skills: Perception +25, Swim +31; Racial Modifiers +4 Perception
Organization: solitary, pair, or pod (3–10)
Treasure: none