SRD:Orca

WHALE, ORCA
These ferocious creatures are about 30 feet long. They eat fish, squid, seals, and other whales.

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.

Hold Breath (Ex): A whale can hold its breath for a number of rounds equal to 8 x its Constitution score before it risks drowning.

Skills: A whale 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 whale has a +4 racial bonus on Spot and Listen checks. These bonuses are lost if its blindsight is negated.

See Wikipedia Entry: Orca