An optical illusion, like a magic picture. If you stare at them really hard they will disappear.
Yes, all mammals' eyes have an iris.
The Iris.
Melanin in the iris gives eyes their color. If you have a lot of melanin in your iris, your eyes would likely be brown.
That you have two iris's. Not really hard to figure out.
iris
The little lines in the iris of the eye are known as iris crypts or furrows. They are natural characteristics of the iris and vary in size and shape from person to person. These crypts help determine the unique pattern of the iris, which is used in biometric identification.
This is determined by the positioning of pigmented cells in the iris of the eye. Blue eyes have the pigment at the back of the iris, dark eyed people have the pigment throughout the iris.
The coloured part of the eye is the iris.
The color of your eyes when scanned is determined by the pigmentation in your iris.
it is known as Iris. contraction or relaxation of iris alters the size of pupil.
The iris.
The sheep has brown eyes.