Survival for the bumblebee depends on its ability to regulate body temperature through a complex energy exchange, and it is this management of energy resources around which Bernd Heinrich enters his discussion of physiology, behavior, and ecological interaction. Along the way, he makes some amusing parallels with the theories of Adam Smith--which, Heinrich observes, work rather well for the bees, however inadequate they may be for human needs.Bumblebee Economics uniquely offers both the professional and amateur scientist a coherent biological model that goes beyond any particular species or level of biological organization. Rich in specific detail and including an extensive appendix on the rearing of bumblebees, as well as a full-color guide to field identification, this book organizes practical knowledge according to a new criterion.In a new preface, Heinrich ranges from Maine to Alaska and north to the Arctic as he summarizes findings from continuing investigations over the past twenty-five years--by himself and others--into the wondrous "energy economy" of bumblebees.

    Simultaneous.

    He couldn't be happier--but what about his bugs?<!--EndFragment-->

    Collects photographs, range maps, and descriptive entries identifying the markings, habits, habitat, and voice of each species.

    The lions snoozed all day long, the elephants enjoyed their baths, and the zebras ate their hay in peace -- all because Helen was spinning webs and catching flies.But one day Helen's webs were swept away. The Keeper had the cages cleaned for the Mayor's inspection tour. Soon the flies were back again and the animals were miserable once more. But not for long...Children will be fascinated and amused by the way Helen solved the problem and won a permanent place of honor for herself in the Zoo.Margaret Bloy Graham's pictures match the wit and charm of her delightful story.

    A field guide to trees around the world, each depicted by a full-color photograph with a caption that describes key features and points of differentiation