Some things in life we can prove to be true; some things we know to be true; and some things we accept to be true. Things we accept become beliefs. A desideratum is a powerful belief, a tool by which we guide our passage through life. When difficult decisions must be made after all facts have been assessed, the desiderata of our lives guide how we proceed. Naturalists cope with the interface between humanity and nature, a confrontation sometimes elegant, sometimes hostile. These are a naturalist's desiderata, the tools by which humanity can survive nature and nature can survive humanity. Series presented by Kevin Cook. Search for Life: Some wildlife openly presents itself to us, like the robin on the lawn; some wildlife, like the monkshood among the aspens, requires patience to find; and some wildlife, like the puma, demands deliberate effort to find. This become the naturalist's quest: the search for life.