"As I write this, I am sitting in a cabin at Cedar Point Biological Station in southwestern Nebraska.... The glorious elemental mixture of earth, water, and sky around me is the home of nearly three hundred species of birds, and comprises one of my favorite places in the world. Here no radio stations blare out the most recent results of meaningless sports events ... no traffic noises confound the senses. Instead the wind is the unquestioned dominating summer influence. The prairie grasses bend willingly and gracefully before it, and the leaves of the cottonwood trees convert its breezes into soft music."
Paul Johnsgard is one of America's most prominent ornithologists and a world authority on waterfowl behavior. In these popularly written, often lyrical essays, he describes some of his most fascinating encounters with birds, from watching the annual mating displays of prairie-chickens on a hilltop in Pawnee County, Nebraska, to attempting to solve some of the mysteries surrounding Australia's nearly flightless musk duck.
Reflecting his worldwide interests and travels, the birds Johnsgard describes inhabit many parts of the globe. Grouping the birds by the element they frequent most—earth, water, or sky—he weaves a wealth of accurate natural history into personal stories drawn from a lifetime of avian observation. And, as a bonus, Johnsgard's lovely pen-and-ink drawings illustrate each species he describes.
The beauty of the robin’s egg is not lost on the child who discovers the nest, nor on the collector of nature’s marvels. Such instances of wonder find fitting expression in the photographs of Rosamond Purcell, whose work captures the intricacy of nests and the aesthetic perfection of bird eggs. Mining the ornithological treasures of the Western Foundation of Vertebrate Zoology, Purcell produces pictures as lovely and various as the artifacts she photographs. The dusky blue egg of an emu becomes a planet. A woodpecker’s nest bears an uncanny resemblance to a wooden shoe. A resourceful rock dove weaves together scrap metal and spent fireworks. A dreamscape of dancing monkeys emerges from the calligraphic markings of a murre egg.
Alongside Purcell’s photographs, Linnea Hall and René Corado offer an engaging history of egg collecting, the provenance of the specimens in the photographs, and the biology, conservation, and ecology of the birds that produced them. They highlight the scientific value that eggs and nest hold for understanding and conserving birds in the wild, as well as the aesthetic charge they carry for us.
How has evolution shaped the egg or directed the design of the nest? How do the photographs convey such infinitesimal and yet momentous happenstance? The objects in Egg & Nest are specimens of natural history, and in Purcell’s renderings, they are also the most natural art.
Along with reproduction, balancing energy expenditure with the limits of resource acquisition is essential for both a species and a population to survive. But energy is a limited resource, as we know well, so birds and mammals—the most energy-intensive fauna on the planet—must reduce energy expenditures to maintain this balance, some taking small steps, and others extreme measures.
Here Brian K. McNab draws on his over sixty years in the field to provide a comprehensive account of the energetics of birds and mammals, one fully integrated with their natural history. McNab begins with an overview of thermal rates—much of our own energy is spent maintaining our 98.6?F temperature—and explains how the basal rate of metabolism drives energy use, especially in extreme environments. He then explores those variables that interact with the basal rate of metabolism, like body size and scale and environments, highlighting their influence on behavior, distribution, and even reproductive output. Successive chapters take up energy and population dynamics and evolution. A critical central theme that runs through the book is how the energetic needs of birds and mammals come up against rapid environmental change and how this is hastening the pace of extinction.
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