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    Butterflies in the Backyard
    Butterflies in the Backyard
    Butterflies in the Backyard
    Ebook148 pages1 hour

    Butterflies in the Backyard

    By Scott Shalaway

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    About this ebook

    Part natural history, part gardening guide, Butterflies in the Backyard contains solid information on butterfly behavior and habitats, and also explains in careful detail how to attract these lovely creatures to your backyard with plants and feeders. Includes up-to-date information on migration and conservation efforts, as well as an identification guide for the most common North American species.
    LanguageEnglish
    PublisherStackpole Books
    Release dateJan 1, 2004
    ISBN9780811750912
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      Book preview

      Butterflies in the Backyard - Scott Shalaway

      pencil.

      Introduction

      If you love to see butterflies in your backyard, if you marvel at the giant silkworm moths that gather at your porch lights on summer nights, if you’re fascinated by the countless caterpillars you find in your garden or on your shade trees, this book is for you. I’ve called upon my thirty years of experience as a naturalist and a seldom used B.S. degree in entomology from the University of Delaware to explain the natural history of the most common members of the order Lepidoptera (from the Greek lepis, meaning scale, and ptera, wing) that we all see in our backyards or on the back forty.

      The ancient Greeks had it right. Their word for butterfly was psyche, which was also their word for the soul. They recognized that adult butter-flies emerge, or are reborn, after passing through what they considered a deathlike pupal stage.

      Though many insect life cycles include complete metamorphosis, butterflies and moths, members of the order Lepidoptera, a subunit of the invertebrate class Insecta, are the ones we notice most often. And unlike our attitude toward many insects, we usually appreciate them rather than try to kill them.

      Butterflies, in particular, catch our fancy. They are colorful, active by day, and frequent visitors to our backyards and gardens. And unlike many birds, which share these appealing characteristics, butterflies don’t rise at the crack of dawn. They rely on the morning sun to warm them up, so butterflies usually wait until midmorning to become active. That means butterfly-watchers, unlike birders, can sleep in.

      Have you ever known anyone to hate butterflies? Neither have I. Some gardeners don’t appreciate the caterpillars—the larval stage—but they still love the adult butterflies as they flutter by. And butterflies pollinate many plants, thus performing an invaluable ecological service.

      To appreciate the biological significance of insects, and by extension lepidopterans, let’s examine the earth’s biodiversity and put the lepidopterans in perspective. This is a risky business at best, because few biologists agree on such numbers, but I’ll use Harvard entomologist Edward O. Wilson as my authority. In The Diversity of Life (1992, Harvard University Press), Wilson estimates the total number of known species of living organisms to be 1,413,000. He also points out that evolutionary biologists agree that this is less than one-tenth the number of species that actually inhabit the planet. Generations of future biologists will be kept busy just finding and naming new species.

      Of those 1.4 million known species, 751,000, or 53.1 percent, are insects. Other major or easily recognized groups include algae (26,900; 1.9 percent), fungi (69,000; 4.9 percent), higher plants (248,400; 17.5 percent), mollusks (50,000; 3.5 percent), fish (18,800; 1.3 percent), amphibians (4,200; 0.30 percent), reptiles (6,300; 0.45 percent), birds (9,000; 0.64 percent), and mammals (4,000; 0.28 percent).

      Insects’ dominance of the planet’s biodiversity is apparent. More than half of all species are insects. And most of those are beetles (290,000; 20.5 percent of all living species). The next largest insect group is Lepidoptera (140,000 species; 9.9 percent). And of the lepidopterans, most (125,500; 89.6 percent) are moths. That leaves about 14,500 species of butterflies, of which approximately 760 occur in North America north of Mexico. (Coincidentally, this is approximately the same number of bird species found in North America.) More than 6,000 species of butterflies are found in the American tropics.

      Curiously, butterflies and moths are not formally recognized as distinct taxonomic groups by entomologists. But then, taxonomists are a curious breed that seldom agree on much of anything. What is agreed on, however, is that butterflies and skippers are relatively recent groups descended from moths. The ability to exploit the diurnal environment may be what originally sparked the evolution of this most familiar group of insects.

      Despite the ambiguity of differences between butterflies and moths, they can be lumped into three groups based on some general traits. Most butterflies are active by day, have a club or swollen tip at the end of the antennae, and hold their wings vertically over the body at rest. Skippers, more butterfly than moth, have a distinctive hook at the tip of the antennae, fly by day, and hold their wings like butterflies. Moths are primarily nocturnal and have pointed antennae that may be feathery or threadlike but lack a swollen or hooked tip, and most perch with their wings held flat at rest.

      Despite the beautiful color photos found in this book, it is not a field guide. The Further Reading section includes a list of my favorite field guides, and there are many good ones. This book is more a celebration of the fascinating natural history of common butterflies and moths. It introduces you to some of North America’s most common lepidopteran species, explores the mysteries of metamorphosis and Monarch migration, and teaches you how to attract more butterflies to your backyard and garden. A basic understanding of the natural history of common species provides a solid foundation for additional study. If you’re ready for a better understanding of this often beautiful and always fascinating group of insects, read on.

      CHAPTER 1

      Lepidopteran Biology

      A life cycle defined by complete metamorphosis from egg, to larva, to pupa, to adult makes the study of butterflies and moths a fascinating journey. Let’s begin with a brief look at each stage of the life cycle and continue through other aspects of lepidopteran biology that can be appreciated in the backyard as well as in a wilderness area.

      LIFE CYCLE

      The Egg. A butterfly or moth begins life as an egg, and as might be expected, these eggs are tiny, usually 1 to 2 millimeters. Most are oval but flat on each end, like miniature barrels. Under a hand lens, the egg walls appear ribbed. Eggs are typically laid on the tops or bottoms of plant leaves, or sometimes on stems.

      Within the egg, the embryonic caterpillar grows quickly. Many species spend only about a week in the egg, but some overwinter as eggs. These lie dormant during the fall and winter months. Whenever development begins, the embryo grows quickly into a tiny larva, which ultimately eats its way out of the egg.

      The Larva. Upon emergence, the tiny larva, which we know as a caterpillar, eats voraciously and grows rapidly. Caterpillars are soft-bodied, and many are covered with protective hairs or spines. Small eyes, tiny antennae, and massive jaws, called mandibles, are found on the head, which is composed of hard keratinized material similar to your fingernails. Sturdy mandibles are necessary to chew tough plant material.

      A caterpillar’s elongate body seems dominated by legs, of which there are two types. The forward three pairs are jointed, located on the thorax, and homologous to those found on adults. Behind these true legs, on the abdomen, are five pairs of prolegs. On the tip of each proleg is a ring of tiny, hooklike structures called crochets. These act almost like suction cups, grasping leaves and twigs as the caterpillars move. Changes in blood pressure cause the prolegs to grip and release objects as they move. The progressive action of the prolegs gives caterpillars their distinctive undulating form of locomotion.

      The primary purpose of the larval stage is to eat and grow. Caterpillars are eating machines. Surprisingly, though, most are quite selective in their eating habits. Many species eat the leaves of a single plant species or specialize on a group of closely related species. So the key to attracting butterflies to any backyard is to provide the species of plants preferred by the caterpillars of the butterflies you wish to attract. Monarch caterpillars, for example, eat only milkweeds, so if you want Monarchs reproducing in your backyard, you need to have some milkweed in your garden.

      Why most caterpillars are so inflexibly host-specific is a fascinating story of the coevolution of plants and insects. Over the eons, insects have waged constant war on plants. Plants responded by developing a variety of protective measures. Some developed thick, heavy leaves that are difficult to eat. Others have thorns, spines, or dense mats of hair. Still others produce toxins that make them distasteful to most herbivores. Plant species that failed to adapt to herbivorous insects went extinct.

      The ecological struggle between plants and insects has left us with a planet populated by

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