Performance Theory Book

I will need to someday go back and reread this more thoroughly because I only read specific chapters this time around. But one of the things I found really interesting was Schechner's interest in anthropology and ethology. In all of the chapters I read, Schechner included speculations about the performance/ritual habits of early humans, and he generally discussed the performance/play/ritual of other primates (and sometimes other types of animals). It seems like he spends more time mining these anthropological and ethological premises for insight than he does discussing actual contemporary performance styles. He functions under the assumption that these ancient or animal performances give us valuable insight into how human performance, ritual, theatre, drama, and play are structured. I'm not saying I think he's wrong, but it is an interesting approach.