Threaten Sign and Eyespots Pattern
Predators' face on Moths' wings
Predators' face on Butterflies' wings
Caterpillars mimic bird's predator's claw
Skull Pattern on Cockroach
Why we think Butterflies are beautiful but Cockroaches are ugly?
They need to be beautiful
Most butterflies are active in daytime. They have good eyesight. Visual attraction is the major way to attract their opposite sex. The more outstanding they look, the higher chance they win the appreciative of their sex partner and the better chance they will have more offspring. For the butterflies lift style, evolution favor their beauty.
Moths are very close related with butterflies and have the similar body structure. They have large wings and scales. However most moths are active at night. Visual attraction is not so important to them. So most moths are not look beautiful and dull in colour. Interestingly, there are some moths active at daytime they are very colourful and sometimes considered they are butterflies.
Actually, not all butterflies are
beautiful. Some butterflies species active after sunset, like the Evening
Brown Butterflies, are not so beautiful. Their wings patterns look rather
like a moth. Like moths, active at night, and they attract their opposite sex
not by visual attraction but by some other means such as fragrance.
They can be so beautiful
Butterflies can be beautiful because they have large wings surface so that beautiful pattern can be shown on those area. Butterflies have scales on wings as moths do. Those scales are believed to evolutes against the spider web. And those scales serve another purpose. Those scales can act as the small pixel so that high resolution pattern can be presented.
There is the disadvantage of being beautiful. Colourful means outstanding from background and will be easily seen by the predator. However, butterflies co-evolution with the plants. Most plants evolutes special taste or toxic to avoid leaf eaters. The butterflies evolutes so that they can accept those bad taste and toxic and they become bad taste and toxic themselves by storing those substance inside their bodies. Their beautiful pattern become a warning signal to their predator.
The most important reason for 'butterflies are so beautiful' is: it is the human instant. Butterflies are active only when there are sunshine and good weather. Where there are butterflies, there always flowers and plants. This implies that there are foods, water, flash air etc., that we human need. Unlike some other insects, such as cockroaches, butterflies do not have big eyes pattern on the thorax, they do not have hairy leg and they do not hide in the dark. When we see butterflies, it always imply there are something good. We, as the mammal, evolutes with the butterflies for million year and it become our instant. So we always think butterflies are beautiful. This is the same reason why we think white cloud is beautiful and dark cloud is not beautiful.
Big eyes pattern on the thorax, hairy leg, hide in the dark........ yes, cockroaches are ugly!
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