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Animals have it all over us when it comes to colour

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Posted August 4, 2017

University of Queensland researchers have developed new knowledge on how animals see and use colour, and how their colour vision has evolved.

The Queensland Brain Institute’s Professor Justin Marshall , co-author of a study undertaken with international colleagues, said colour had an important role in reproduction and prey–predator interactions, although it served diverse functions in various animals.

“Coloration serves as an important source of information about animals, and the way in which colours are perceived differs between species,” said Professor Marshall.

Some animals use fluorescence or ‘enhanced’ colours. Credit: The University of Queensland

“I work with mantis shrimp, but also other oceanic animals, because their colour vision is very different to ours.

“Mantis shrimp have four times as many colour receptors as we humans do. We have three – red, green, and blue – and they have 12.”

The research paper provides insight into how a variety of animals use colours invisible to the human eye, such as ultraviolet light, for species-specific purposes.

“Some animals use fluorescence or ‘enhanced’ colours,” Professor Marshall said.

“We humans have reinvented this – and we use fluorescence in everyday objects, such as highlighter pens, or in washing power to achieve that ‘whiter-than-white’ look.

“Humans have realised that we can use chemicals boost to colours – light is taken in by the chemical and re-emitted, so it literally glows.”

Professor Marshall said an understanding of colours could be useful in everyday life.

“The challenge is to better understand how animals use their colour vision and their colours for survival,” he said.

Source: The University of Queensland

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