Let's all just be thankful that there are no owls the size of passenger jets.

That's, again, the same law. It would break under its own weight.

Can you explain this further?

If you doubled the length of an owl (or any other object) by scaling it up, then it would quadruple (2²) the surface area, and octuple (2³) the volume.

The parent comment seemed to be suggesting the noise would scale with the surface area, while mass scales with the volume. The latter is definitely true, but I don't know about the former