A latch holds the handles together, typically mounted on the one facing the cutting edge (the "bite handle").. Adult butterflies have large, often brightly coloured wings, and conspicuous, fluttering flight. Some like the oakleaf butterfly and autumn leaf are remarkable imitations of leaves. As it hardens it contracts, deforming the shape of the egg. , Butterflies feed primarily on nectar from flowers. Picture Caption: A Butterfly Release During A Memorial Service Using Butterflies Purchased From Cloverlawn Butterflies . The polarized light near the ultraviolet spectrum appears to be particularly important. The origin of the knives is unclear. , The earliest Lepidoptera fossils are of a small moth, Archaeolepis mane, of Jurassic age, around 190 million years ago (mya). The front eight segments have spiracles and the terminal segment is modified for reproduction. If so, this group is here for you. Some also derive nourishment from pollen, tree sap, rotting fruit, dung, decaying flesh, and dissolved minerals in wet sand or dirt.  Vision is well developed in butterflies and most species are sensitive to the ultraviolet spectrum. Some butterflies, especially in the tropics, have several generations in a year, while others have a single generation, and a few in cold locations may take several years to pass through their entire life cycle.  In the Philippines, a lingering black butterfly or moth in the house is taken to mean a death in the family. The first maxillae are elongated into a tubular proboscis which is curled up at rest and expanded when needed to feed. , Butterflies use their antennae to sense the air for wind and scents. , "Collecting" means preserving dead specimens, not keeping butterflies as pets.  Many are well camouflaged; others are aposematic with bright colours and bristly projections containing toxic chemicals obtained from their food plants.  The bacterium Bacillus thuringiensis has been used in sprays to reduce damage to crops by the caterpillars of the large white butterfly, and the entomopathogenic fungus Beauveria bassiana has proved effective for the same purpose. Sandwich constructed balisong knives are assembled in layers that are generally pinned or screwed together though may sometimes use a ball-bearing system. Cultural Entomology November 1997 Fourth issue.  Eric Carle's children's book The Very Hungry Caterpillar portrays the larva as an extraordinarily hungry animal, while also teaching children how to count (to five) and the days of the week. A Roman sculpture depicts a butterfly exiting the mouth of a dead man, representing the Roman belief that the soul leaves through the mouth. These may also cause ambush predators such as spiders to approach from the wrong end, enabling the butterflies to detect attacks promptly. , Many tropical butterflies have seasonal forms for dry and wet seasons. , Butterflies are widely used in objects of art and jewellery: mounted in frames, embedded in resin, displayed in bottles, laminated in paper, and used in some mixed media artworks and furnishings.  The Melissa Arctic (Oeneis melissa) overwinters twice as a caterpillar. Its distinct features are two handles counter-rotating around the tang such that, when closed, the blade is concealed within grooves in the handles. Although most caterpillars are herbivorous, a few species are predators: Spalgis epius eats scale insects, while lycaenids such as Liphyra brassolis are myrmecophilous, eating ant larvae. The oldest butterflies are from the Palaeocene MoClay or Fur Formation of Denmark, approximately 55 million years old.  Basking is an activity which is more common in the cooler hours of the morning.  Copulation takes place tail-to-tail and may last from minutes to hours. , Butterflies in their adult stage can live from a week to nearly a year depending on the species. These prolegs have rings of tiny hooks called crochets that are engaged hydrostatically and help the caterpillar grip the substrate. The thorax is composed of three segments, each with a pair of legs.  Colour vision may be widespread but has been demonstrated in only a few species. The species is endangered, and is one of only three (3) insects (the other two being butterflies as well) to be listed on Appendix I of CITES, making international trade illegal..  Butterfly caterpillars have three pairs of true legs on the thoracic segments and up to six pairs of prolegs arising from the abdominal segments. The name "balisong" is derived from barangay (village) Balisong, part of the municipality of Taal, Batangas province, which along with the neighboring barangay Pandayan, were the original manufacturing centers of the knives in the Philippines. Each species of butterfly has its own host plant range and while some species of butterfly are restricted to just one species of plant, others use a range of plant species, often including members of a common family. The balisong has been outlawed in several countries, mainly due to its easy utility in crimes and ability to be easily concealed. Winged adults lay eggs on the food plant on which their larvae, known as caterpillars, will feed. The antennae are composed of many segments and have clubbed tips (unlike moths that have tapering or feathery antennae). The oldest American butterfly is the Late Eocene Prodryas persephone from the Florissant Fossil Beds, approximately 34 million years old. , As in all insects, the body is divided into three sections: the head, thorax, and abdomen.  The traditional balisong is also known as veinte y nueve, or "twenty-nine," in the Philippines, because they are 29 cm (11 in) long when opened. , Traditionally, butterflies have been divided into the superfamily Papilionoidea excluding the smaller groups of the Hesperiidae (skippers) and the more moth-like Hedylidae of America. Near the end of each stage, the larva undergoes a process called apolysis, mediated by the release of a series of neurohormones. Butterflies are insects in the macrolepidopteran clade Rhopalocera from the order Lepidoptera, which also includes moths. , Many species of butterfly maintain territories and actively chase other species or individuals that may stray into them. 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