IKS Krtas
The IKS Krtas was a Klingon Bird-of-Prey that was in service with the Klingon Defense Force in the late 24th century. It was a part of Relga's fleet.
In 2382, near the edge of Klingon space, it ran into an unstable Schrödinger possibility field from a quantum fissure, where it was struck by an energy wave that transformed it and its crew into Klingons and a Klingon Bird-of-Prey from the mid 23rd century. It was destroyed after control was lost, and it struck another nearby Bird-of-Prey. (LD: "The New Next Generation")