|Posted by aakarsha handa on April 5, 2011 at 6:42 AM|
I am back with another mind boggling butterfly fact!!We have generally heard that all the insects including butterflies have two eyes.But actually butterflies have 12,000 eyes.Amazing but yes,true!! Butterflies have Compound Eyes.First let us get familiar with the concept of compound eyes.
Most invertebrates -- crustaceans and insects -- have compound eyes. A compound eye is made up of many separate units called ommatidia (singular: ommatidium). Each unit has its own surface area, lens, and optic nerve fiber. It receives light from a small part of the animals field of view. The animal's brain integrates these views into a single image.An insect's compound eyes bulge out and have a wide field of view. The lenses in compound eyes can't change focus, so insects can't see things that are far away. However, most things that concern an insect are up close and personal. The compound eye is very good at seeing things nearby and detecting motion, as anyone who's tried to swat a fly knows.
Butterflies has paired of compound eyes, it contains many small lenses through which it can see in compound, it has many small photoreceptor( celss which receive light ) through which all images come to retina and make it in one image so that butterfly can see clearly and move to correct direction.A butterfly has 2 eyes with 6000 eyelets or ommatidia in each eye. An ommatidia is like a eye within an eye. It actually divides the eyes in a shape of a disco ball & helps the butterfly to locate things easier. They work like the pixels of a camera.So therefore, a butterfly has 12,000 eyelets in 2 eyes.
butterfly 's compound eye
hackberry emperor butterfly's eye
so that is all for today!i will be back with another blog very soon.