Part I Introduction.- Human Population Increase and Changes in Production and Usage of Trace Elements in the Twentieth Century and First Decades of the Twenty-First Century. - Endothermic Animals as Biomonitors of Terrestrial Environments. - Part II Selected Trace Elements. - Chromium, Cr. - Copper, Cu. - Iodine, I. - Iron, Fe. - Manganese, Mn. - Molybdenum, Mo. - Nickel, Ni. - Selenium, Se. - Zinc, Zn. - Aluminum, Al. - Arsenic, As. - Cadmium, Cd. - Fluorine, F. - Lead, Pb. - Mercury, Hg. - Silver, Ag. - Tin, Sn.