Whale, Cachalot (CR 7)

Gargantuan Animal
Alignment: Always neutral
Initiative: +1 (Dex); Senses: blindsight 120 ft., low-light vision, Listen +15*, and Spot +14*

AC: 16 (-4 size, +1 Dex, +9 natural), touch 7, flat-footed 15
Hit Dice: 12d8+87 (141 hp)
Fort +15, Ref +9, Will +6
Speed: Swim 40 ft.
Space: 20 ft./15 ft.
Base Attack +9; Grapple +33
Attack: Bite +17 melee
Full Attack: Bite +17 melee and tail slap +12 melee
Damage: Bite 4d6+12, tail slap 1d8+6
Special Attacks/Actions: -
Abilities: Str 35, Dex 13, Con 24, Int 2, Wis 14, Cha 6
Special Qualities: hold breath
Feats: Alertness; Diehard; Endurance; Improved Natural Attack (bite); Toughness
Skills: Listen +15*, Spot +14*, and Swim +20
Advancement: 13-18 HD (Gargantuan); 19-36 (Colossal)
Climate/Terrain: Temperate aquatic
Organization: Solitary or pod (6-11)
Treasure/Possessions: None

Source: Monster Manual

Also known as sperm whales, these creatures can be up to 60 feet long. They prey on giant squid.

Blindsight (Ex): Whales can "see" by emitting high-frequency sounds, inaudible to most other creatures, that allow them to locate objects and creatures within 120 feet. A silence spell negates this and forces the whale to rely on its vision, which is approximately as good as a human's.

Skills: Whales gain a +4 racial bonus to Spot and Listen checks. These bonuses are lost if Blindsight is negated.