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animals.howstuffworks.com/insects/butterfly-wing-fragility1.htm

Although you can't see them, a system of miniscule veins runs through the wings and if the vein on the forewing gets broken, the butterfly will usually die [source: Opler]. So while death isn't necessarily imminent for a butterfly if you happen to touch its wings, the odds aren't on its side either.

www.enchantedlearning.com/subjects/butterflies/anatomy/Wings.shtml

Butterfly Wing Areas: A butterfly's wings are divided into the areas named in the illustration to the left. The Coupling of the Wings: During flight, the forewing and hindwing are held together and function as one wing. The coupling mechanism differs in different species.

answers.yahoo.com/question/index?qid=20130114163524AA61Cxm

Some biological characteristics are analogous (also called "convergent"), which means that they serve the same function in different species but they evolved independently rather than from the same embryological material or from the same structures in a common ancestor. An example of analogous structures would be the wings on butterflies, bats and and birds.

en.wikipedia.org/wiki/Butterfly

Butterfly adults are characterized by their four scale-covered wings, which give the Lepidoptera their name (Ancient Greek λεπίς lepís, scale + πτερόν pterón, wing).These scales give butterfly wings their colour: they are pigmented with melanins that give them blacks and browns, as well as uric acid derivatives and flavones that give them yellows, but many of the blues, greens ...

lepdata.org/monteiro/Evo-devo pdfs/Weatherbee_et_al_1999.pdf

Ultrabithorax function in butterfly wings and the evolution of insect wing patterns Scott D. Weatherbee*, H. Frederik Nijhout†, Laura W. Grunert†, Georg Halder*, Ron Galant*, Jayne Selegue* and Sean Carroll* Background: The morphological and functional evolution of appendages has

www.answers.com/Q/What_function_does_butterfly_wings_and_bird_wings_structures...

What function do the butterfly and bird wings share? They flap and create enough lift for takeoff, and can potentially be used for camouflage. That's the only shared characteristic though, because ...

feener.biology.utah.edu/courses/5445/Lecture/Bio5445 Lecture 12.pdf

Flight I: Structure & Function of Wings • Wings in living insects serve a number of functions, including active flying, gliding, parachuting, altitude stability while jumping, thermoregulation, and sound production. Today’s lecture covers the structure and function of wings in modern insects.

simple.wikipedia.org/wiki/Butterflies

Certainly all reptiles and monkeys have good colour vision, so that butterfly coloration works just as well on them as it does on birds. Defenses. The extraordinary colors and patterns on the wings and body can only be understood in terms of their function. Some of the most obvious functions of color are:

www.lsu.edu/botanic-gardens/images/TheFunctionsofButterflyBodyPartsinallStage...

The Functions of a Butterfly’s Body Parts Throughout its Life Cycle Focus Overview Students who have been previously exposed to a butterfly’s life cycle will have the opportunity to learn about the body parts of the butterfly in each of the four stages of its life cycle. Learning Objectives The student will be able to:

www.scienceclarified.com/Bi-Ca/Butterflies.html

Butterflies are popular, well-known insects with large, colorful wings covered with tiny scales. Together with moths, butterflies make up the order Lepidoptera, which contains over 150,000 species or kinds. Scientists estimate that about 15,000 butterfly species exist worldwide.