As for determining which animals have been strangled and not drained of their blood, we must understand that the focus was on the quantity of blood remaining in the meat of the animal. It was not the fact that the animal was strangled that kept it from being eaten, but the fact that it was never drained of its blood.
The Eocene constitutes the middle part of the Paleogene period (65-23 million years ago), preceded by the Paleocene and succeeded by the Oligocene epoch (34-23 million years ago); all of these periods and epochs were part of the Cenozoic Era (65 million years ago to the present).
The Pleistocene is the geological epoch which lasted from about 2.6 million years ago to about 11,700 years ago, comprising the most period of repeated glaciations. Both marine and land faunas were essentially like today, albeit mammals were generally larger than their modern descendants.