People love watching colorful butterflies float from flower to flower. From the tiniest blues to the largest swallowtails, how much do you really know about these insects? Here are 10 fascinating facts about butterflies.

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Butterfly wings are transparent

How can that be? We know butterflies as perhaps the most colorful, vibrant insects around! A butterfly's wings are covered by thousands of tiny scales, and these scales reflect light in different colors. But underneath all of those scales, a butterfly wing is actually formed by layers of chitin, the same protein that makes up an insect's exoskeleton. These layers are so thin you can see right through them. As a butterfly ages, scales fall off the wings, leaving spots of transparency where the chitin layer is exposed.

Butterflies taste with their feet

Butterflies have taste receptors on their feet to help them find their host plants and locate food. A female butterfly lands on different plants, drumming the leaves with her feet until the plant releases its juices. Spines on the back of her legs have chemoreceptors that detect the right match of plant chemicals. When she identified the right plant, she lays her eggs. A butterfly will also step on its food, using organs that sense dissolved sugars to taste food sources like fermenting fruit.

Butterflies live on an all-liquid diet

Speaking of butterflies eating, adult butterflies can only feed on liquids, usually nectar. Their mouthparts are modified to enable them to drink, but they can't chew solids. A proboscis, which functions as a drinking straw, stays curled up under the butterfly's chin until it finds a source of nectar or other liquid nutrition. It then unfurls the long, tubular structure and sips up a meal. A few butterflies feed on sap, and some even resort to sipping from decaying carrion. No matter the meal, they suck it up a straw.

A butterfly must assemble its proboscis as soon as it emerges from the chrysalis

A butterfly that can't drink nectar is doomed. One of its first jobs as an adult butterfly is to assemble its mouthparts. When a new adult emerges from the pupal case or chrysalis, its mouth is in two pieces. Using palpi located adjacent to the proboscis, the butterfly begins working the two parts together to form a single, tubular proboscis. You may see a newly emerged butterfly curling and uncurling the proboscis over and over, testing it out.

Butterflies drink from mud puddles

A butterfly cannot live on sugar alone; it needs minerals, too. To supplement its diet of nectar, a butterfly will occasionally sip from mud puddles, which are rich in minerals and salts. This behavior, called puddling, occurs more often in male butterflies, which incorporate the minerals into their sperm. These nutrients are then transferred to the female during mating, and help improve the viability of her eggs.

Butterflies can't fly if they're cold

Butterflies need an ideal body temperature of about 85ºF to fly. Since they're cold-blooded animals, they can't regulate their own body temperatures. The surrounding air temperature has a big impact on their ability to function. If the air temperature falls below 55ºF, butterflies are rendered immobile, unable to flee from predators or feed. When air temperatures range between 82º-100ºF, butterflies can fly with ease. Cooler days require a butterfly to warm up its flight muscles, either by shivering or basking in the sun. Even sun-loving butterflies can get overheated when temperatures soar above 100° F and may seek shade to cool down.

A newly emerged butterfly can't fly

Inside the chrysalis, a developing butterfly waits to emerge with its wings collapsed around its body. When it finally breaks free of the pupal case, it greets the world with tiny, shriveled wings. The butterfly must immediately pump body fluid through its wing veins to expand them. Once its wings reach full-size, the butterfly must rest for a few hours to allow its body to dry and harden before it can take its first flight.

Butterflies live just a few weeks, usually

Once it emerges from its chrysalis as an adult, a butterfly has only 2-4 short weeks to live, in most cases. During that time, it focuses all its energy on two tasks – eating and mating. Some of the smallest butterflies, the blues, may only survive a few days. Butterflies that overwinter as adults, like monarchs and mourning cloaks, can live as long as 9 months.

Butterflies are nearsighted, but they can see and discriminate a lot of colors

Within about 10-12 feet, butterfly eyesight is quite good. Anything beyond that distance gets a little blurry to a butterfly, though. Butterflies rely on their eyesight for vital tasks, like finding mates of the same species and finding flowers on which to feed. In addition to seeing some of the colors we can see, butterflies can see a range of ultraviolet colors invisible to the human eye. The butterflies themselves may have ultraviolet markings on their wings to help them identify one another and locate potential mates. Flowers, too, display ultraviolet markings that act as traffic signals to incoming pollinators like butterflies – 'pollinate me!'

Butterflies employ all kinds of tricks to keep from being eaten

Butterflies rank pretty low on the food chain, with lots of hungry predators happy to make a meal of them. Some butterflies fold their wings to blend into the background, using camouflage to render themselves all but invisible to predators. Others try the opposite strategy, wearing vibrant colors and patterns that boldly announce their presence. Bright colored insects often pack a toxic punch if eaten, so predators learn to avoid them. Some butterflies aren't toxic at all, but pattern themselves after other species known for their toxicity. By mimicking their foul-tasting cousins, they repel predators.