A butterfly is an insect of the order Lepidoptera. The scope of the term butterflies depends on how far the concept is extended. Currently, most experts include the superfamilies Hedyloidea (the American moth-butterflies), Hesperioidea (the skippers) and Papilionoidea (the so-called 'true' butterflies). This concept of butterflies including the Hedyloidea is an only recently expanded one. Like many Lepidoptera, butterflies are notable for their unusual life cycle with a larval caterpillar stage, an inactive pupal stage and a spectacular metamorphosis into a familiar and colourful winged adult form, and most species being day-flying, they regularly attract attention. The diverse patterns formed by their brightly coloured wings and their erratic-yet graceful-flight have made butterfly watching a popular hobby.
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A day (symbol: d) is a unit of time equivalent to 24 hours. It is not an SI unit but it is accepted for use with SI. The SI unit of time is the second. The term comes from the Old English dg, with similar terms common in all other Indo-European languages, such as dies in Latin and dive in Sanskrit. Contents 1 Definitions 1.1 International System of Units (SI) 1.2 Astronomy 1.3 Colloquial 2 Introduction 3 Civil day 4 Leap seconds 5 Astronomy 6 Boundaries of the day 7 Metaphorical days
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