Medium (Animal) CR 1/2
HP 11, hd2d8+2 AC 15 (+3 Dex, +2 natural), touch 13, flat-fooded 12 Fort +4, Ref +6, Will +1 Speed Swim 80 ft. (16 squares) Initiative +3 Spot , Listen
Standard attacks BAB +1, Grapple +1
Attacks
Full attack: Slam +4 melee (2d4)
Special Attacks/Qualities
?
Blindsight 120 ft., hold breath, low-light vision
Skills Listen +8*, Spot +7*, Swim +8
Feats Weapon Finesse
Str 11 Con 13 Dex 17 Int 2 Wis 12 Cha 6
Alignment Always neutral, Environment Temperate aquatic, Organisation Solitary, pair, or school (3?20)

Porpoises are mammals that tend to be playful, friendly, and helpful. A typical porpoise is 4 to 6 feet long and weighs 110 to 160 pounds. The statistics presented here can describe any small whale of similar size.

Blindsight (Ex): Porpoises 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 porpoise to rely on its vision, which is approximately as good as a human?s.
Hold Breath (Ex): A porpoise can hold its breath for a number of rounds equal to 6 x its Consitution score before it risks drowning.
Skills: A porpoise has a +8 racial bonus on any Swim check to perform some special action or avoid a hazard. It can always choose to take 10 on a Swim check, even if distracted or endangered. It can use the run action while swimming, provided it swims in a straight line. *A porpoise has a +4 racial bonus on Spot and Listen checks. These bonuses are lost if its blindsight is negated.
SEE WIKIPEDIA ENTRY:

• Porpoise
  
• Dolphin
  

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System Reference Document -> List of Creatures (SRD)