As recently as 11,000 years ago--"near time" to geologists--mammoths, mastodons, gomphotheres, ground sloths, giant armadillos, native camels and horses, the dire wolf, and many other large mammals roamed North America. In what has become one of science's greatest riddles, these large animals vanished in North and South America around the time humans arrived at the end of the last great ice age. Part paleontological adventure and part memoir, "Twilight of the Mammoths "presents in detail internationally renowned paleoecologist Paul Martin's widely discussed and debated "overkill" hypothesis to explain these mysterious megafauna extinctions. Taking us from Rampart Cave in the Grand Canyon, where he finds himself "chest deep in sloth dung," to other important fossil sites in Arizona and Chile, Martin's engaging book, written for a wide audience, uncovers our rich evolutionary legacy and shows why he has come to believe that the earliest Americans literally hunted these animals to death.
As he discusses the discoveries that brought him to this hypothesis, Martin relates many colorful stories and gives a rich overview of the field of paleontology as well as his own fascinating career. He explores the ramifications of the overkill hypothesis for similar extinctions worldwide and examines other explanations for the extinctions, including climate change. Martin's visionary thinking about our missing megafauna offers inspiration and a challenge for today's conservation efforts as he speculates on what we might do to remedy this situation--both in our thinking about what is "natural" and in the natural world itself.

Fieldiana Anthropology: A Continuation Of The Anthropological Series Of Field Museum Of Natural History, V41.

Fieldiana Anthropology: A Continuation Of The Anthropological Series Of Field Museum Of Natural History, V41.

Hidden high in the Sierra de Guatemala mountain range of northeastern Mexico in the state of Tamaulipas is the northernmost tropical cloud forest of the Western Hemisphere. Within its humid oak-sweetgum woodlands, tropical and temperate species of plants and animals mingle in rare diversity, creating a mecca for birders and other naturalists.

Fred and Marie Webster first visited Rancho del Cielo, cloud forest home of Canadian immigrant Frank Harrison, in 1964, drawn by the opportunity to see such exotic birds as tinamous, trogons, motmots, and woodcreepers only 500 miles from their Austin, Texas, home. In this book, they recount their many adventures as researchers and tour leaders from their base at Rancho del Cielo, interweaving their reminiscences with a history of the region and of the struggle by friends from both sides of the border to have some 360,000 acres of the mountain declared an area protected from exploitation--El Cielo Biosphere Reserve. Their firsthand reporting, enlivened with vivid tales of the people, land, and birds of El Cielo, adds an engagingly personal chapter to the story of conservation in Mexico.