Posts tagged ‘Scales’

How do butterflies get their color?

Butterfly

The colorful pattern on a butterfly’s wings is formed by thousands of flat scales as fine as dust.  The tiny scales overlap each other like shingles on a roof, and cover the butterfly’s wings.  With the help of a magnifying glass you can see that the scales make the colorful patterns.

The soft scales easily rub off as a powdery “butterfly dust” when something touches the wings.  Then the wings look pale and transparent.  A butterfly’s color helps it blend in with its surroundings.  The butterfly escapes its enemies by means of this protective coloration. – Dick Rogers

Why fish don’t sink?

Fish

A fish, with its bones and scales, is heavier than the water it displaces. Under normal circumstances, it would tend to sink.  But most bony fishes have a balloon-like sac inside their bodies called an “air bladder” that acts as a float to keep them from sinking.  The air bladder fills up with some of the oxygen dissolved in the fish’s blood.

Some fish, such as pike and catfish gulp air at the surface of the water to fill their air bladders.  A shark has no air bladder to buoy it up.  It must constantly be swimming in order to keep from sinking. – Dick Rogers