I was basing my point on the angle at which the bird would've had to been traveling to cause damage on top of the engine (nearly perpendicular to the forward motion of the plane). This means that the odds of a bird diving and hitting the plane are not very good.
Also, consider the fact that the plane was traveling SYD
.... not many birds flying around over the Pacific.
Oh, and I've certainly seen what birds can do to a plane, and it's not pretty!