does it have any defence mechanism?
Yes - some of them being bright colours in unpalatable butterflies (aposematism);Camouflage ;  false head consisting of eyespots
Butterfly
These defence mechanisms are effective only if they are well advertised; this has led to the evolution of bright colours in unpalatable butterflies (aposematism). This signal is commonly mimicked by other butterflies, usually only females. A Batesian mimic imitates another species to enjoy the protection of that species' aposematism. The common Mormon of India has female morphs which imitate the unpalatable red-bodied swallowtails, the common rose and the crimson rose. Müllerian mimicry occurs when aposematic species evolve to resemble each other, presumably to reduce predator sampling rates; "Heliconius" butterflies from the Americas are a good example.
Camouflage is found in many butterflies. Some like the oakleaf butterfly and autumn leaf are remarkable imitations of leaves. As caterpillars, many defend themselves by freezing and appearing like sticks or branches. Others have deimatic behaviours, such as rearing up and waving their front ends which are marked with eyespots as if the
what is the scientific classification of a butterfly Butterflies are insects in the macrolepidopteran clade Rhopalocera from the order Lepidoptera, which also includes moths. from where did it get its name? It derives from the Old English "butorflēoge" what kind of language is the above mentioned one? It is the earliest recorded form of the English language, spoken in England and southern and eastern Scotland in the early Middle Ages. did any other languages influence it? Latin, Old Norse how is the latter related to english? Old English and Old Norse were related languages. It is therefore not surprising that many words in Old Norse look familiar to English speakers. This is because both English and Old Norse stem from a Proto-Germanic mother language how many vowels does it have? Old Norse had nasalized versions of all ten vowel places. and consonants? Old Norse has six plosive phonemes what are its modern versions? Icelandic, Faroese, Norwegian where is the middle one spoken? Faroe Islands, Denmark name a few faunas from the islands? Grey seals, mountain hare, common eider, Faroe pony describe the music over there? The Islands have their own orchestra (the classical ensemble "Aldubáran") and many different choirs; the best-known of these is "Havnarkórið". from where did the butterfly get its name? From the Old English "butorflēoge" what is its life cycle? The vast majority of butterflies have a four-stage life cycle; egg, larva (caterpillar), pupa (chrysalis) and imago (adult). any technology inspired by it? Yes - Study of the structural coloration of the wing scales of swallowtail butterflies has led to the development of more efficient light-emitting diodes, and is inspiring nanotechnology research to produce paints that do not use toxic pigments
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Butterfly [SEP] Defences
Butterflies protect themselves from predators by a variety of means. Chemical defences are widespread and are mostly based on chemicals of plant origin. In many cases the plants themselves evolved these toxic substances as protection against herbivores. Butterflies have evolved mechanisms to sequester these plant toxins and use them instead in their own defence. These defence mechanisms are effective only if they are well advertised; this has led to the evolution of bright colours in unpalatable butterflies (aposematism). This signal is commonly mimicked by other butterflies, usually only females. A Batesian mimic imitates another species to enjoy the protection of that species' aposematism.