I often think about this when imagining what dinosaurs might have looked like. We can see their relatives today, but you can only imagine what the originals would have looked like.
I think pegging is an option when one of them doesn't have scientifically big enough equipment. It's like telescopes. If you don't have a big enough telescope, you can't see that far. In the case when the telescope is not big enough, maybe you have to strap on another telescope?