Lantean sea creature

From The Stargate Omnipedia


Underwater animal native to Lantea's oceans, approximately six to eight times the size of an Ancient Puddle Jumper.

It is not known whether this creature is a mammal, though it exhibits traits of Earth's whales, including a heightened curiosity and the ability to vocalize. Its hearing threshold makes it able to detect the high-pitched frequencies used by Puddle Jumper distress beacons. The animal can swim to significant depths well beyond 1,000 meters beneath the surface.


Grace Under Pressure - Dr. McKay owes his life to an enormous sea creature which keeps him company while Colonel Sheppard's Puddle Jumper tracks their position.
Echoes - The planet's whale population signals a warning to Atlantis of an impending natural disaster -- a burst of deadly radiation from the sun.