In the Pre-Cambrian era there were no image-forming eyes, and
organisms just had basic light receptors to tell the difference
between light and dark. For colour to exist there needs to be
light, an image-forming eye and a brain to process the data.Around
543 million years ago roughly six major groups of animals existed.
Approximately 20 million years later, a blink of the eye in
evolutionary history, there were 38 groups - similar to the number
that exists today. This dramatic increase may be explained by the
evolution of image-forming eyes. With the world suddenly in focus
for many species, the benefit of being able to hide oneself, appear
threatening or attractive and communicate with one's own species
became much more acute.Drawing on spectacular specimens from the
Museum's collections, Colour and Vision looks at the evolution of
the eye, the uses of colour in nature, from a warning or disguise
to an irresistible invitation, and explains how colour works.
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