The mean body mass of mammals has decreased over the Quaternary period starting around 5 million years ago.

“if you go back to the dinosaurs okay there was another period where are they you generals wrong right so exceptional to hit very big animals around and then and then what happens here Miki because this is what such a cool point that you had in this talk with HS is that okay 2.5 million years ago it just drops like a rock because whoa the size of the animal I don't know actually most probably was even sharper than what you see because the the impressive information that I have and it's lying around is that the actual decline they started about six seven hundred thousand years so this it's deeper than one is what you see here okay but it doesn't it's not recipes two for every book I don't I don't see how can anybody say this is nothing to do with you this is human because climate which is the second contender alternative continue there were all types of climate five million years and there was no biased extinction of margin so you're saying these people might argue there was a large extinction from animals because weather change but you're saying there have been weather changes preceding this that did not cause large extinctions and we're not talking about the dinosaurs here because we're talking about a period we're not talking about the dinosaurs extinction we're talking about a the last 65 million years and more specifically in the last two and a half million years there was this cordis or maybe perhaps you're saying the last six hundred thousand years this very rapid decline in the size of the animals and that that this may indicate that humans were hunting these animals frequently causing mass extinctions and that that has changed the way that we have been eating”