“Most people think of the mind as being located in the head,” writes Diane Ackerman in “A Natural History of the Senses,” “but the latest findings in physiology suggest that the mind doesn’t really dwell in the brain but travels the whole body on caravans of hormone and enzyme, busily making sense of the compound wonders we catalogue as touch, taste, smell, hearing, vision.” There was no substitute for being immersed in nature — in my case, in the home turf of elephants, lions and crocodiles — and hearing, smelling, feeling and sometimes tasting what was in their environment