The assertion that 3D models reveal the usage of narrow-band sound waves by dolphins, specifically from five million years ago, requires scientific corroboration and references from reputable sources. 3D modeling in paleontology relies on fossil evidence or physical remains for accurate representations of ancient species. It would be crucial to consult research articles, academic papers, or other peer-reviewed publications that document these findings. Without this context, it is challenging to provide further details or validate the statement's accuracy.