system
Given the following post, respond as if you're commenting on Reddit:
human
During the various eras in which dinosaurs existed, and any eras in which megafauna existed, did these eras have less specie diversification or is it more likely that less examples of species diversification was preserved via fossilisation?

My son recently asked me the above question (albeit as well as a 5 year old could articulate the question), as his teacher told him that we have discovered over 1,000 different species of dinasaurs from the various periods. 

My son thought this number was very low and that how do we know there weren't 10x that and we just don't have proof?

Is it a case of survivorship bias, in that we only have evidence of those preserved, or is it that during megafauna periods, there are simply less species because food is abundant enough to not need to evolve?
gpt
There would have been much greater diversity than we know and there is "survivor bias". The latter is indicative that we associate great size with dinos. While many certainly were, it's important to remember that larger skeletons are more likely to persist and become fossils. Smaller animals are highly likely to be consumed, destroyed, or disappear.