[DonaldC]

"You do see fossils of animals with deformities (including humans and their ancestors). You see them alive and running around today, why would think that they didn't exist in the fossil record?

Anything that was truly not viable would be limited to a single isolated individual and hence you would expect to find them fairly rarely, but they do exist."

It just seems to me, and I am not an expert in the field, that there should be a huge quantity of examples of random mutations, viable or not, relative to what would have had to occur on the scales we are talking about.

[ndt]

"It just seems to me, and I am not an expert in the field, that there should be a huge quantity of examples of random mutations, viable or not, relative to what would have had to occur on the scales we are talking about."

The vast majority of mutations are not so extreme as to even be visible in living things much less in the fossil record. You seem to be expecting horns to appear on a rabbit.