>>/41120/
> The possibility of using the biomass of animals that died naturally or were killed by predators for food was provided by a tough instinct that did not allow him to kill anyone.
This sounds familiar.
Since it's not the actual work of Porshnev it's little short on actual data (for example up to the 6th page - where I am now at the moment - zoological data is frequently referred to, but it isn't really there to know what is that data), and more on opinions, but an interesting read nevertheless. Now I have a little time, but not sure if I'm gonna finish, some stuff to do before it gets dark outside.