If you flaunt it, you've got it: how red-heads top the pecking order

Jan 01, 2006
Gouldian Finches. Copyright Sarah Pryke
Gouldian Finches. Copyright Sarah Pryke

Red-headed finches dominate their black-headed and yellow-headed peers by physical aggression and by the mere fact of being red-headed, according to research published in the Proceedings of the Royal Society.

University of New South Wales biologists made the discovery following experiments with stunningly colourful Gouldian finches (Erythrura gouldiae). Among Australia's most endangered native birds, Gouldian finches are now restricted to small isolated populations across the tropical north.

The bird has a bright green upper body, blue rump, violet-purple chest, yellow breast and bright azure-blue collar. But its most distinctive feature is its head, which occurs in one of three discrete colours: red, yellow or black. This colour polymorphism makes the Gouldian finch unique, with three distinct forms all naturally occurring and inter-breeding in the same wild populations.

The scientist's first experiment aimed to reveal if there were behavioural differences between birds that related to the three head colours.

Observing contests between two unfamiliar males over access to food, they found that red-headed males were more aggressive and dominant than black-headed males, while both red and black-headed males dominated yellow-headed males.

In their second experiment, the scientists experimentally changed the head colours of the birds by dying them red or black to discover whether head colour was a communication "signal" between birds.

"Birds were reluctant to compete with opponents that had red dyed heads, demonstrating that they pay attention to this signal of dominance and use it to avoid getting into fights," says one of the study's authors, Dr Sarah Pryke, a Research Fellow in the School of Biological, Earth and Environmental Sciences.

"Red-headed birds that were temporarily dyed were still the most aggressive. This shows that red-heads are truly very aggressive and that it pays black- and yellow-headed birds to avoid fights with them.

"These findings suggest that red-heads have a dominance advantage and will out-compete the other two in contests over limited resources like food and the best nesting sites.

"As well, they show how the expression of a discrete colour is linked to a behavioural trait, and give us a new insight into how colour signals evolve as a form of communication in animals."

Source: University of New South Wales

Explore further: Younger workers more likely to 'fake a sickie', says new national poll

add to favorites email to friend print save as pdf

Related Stories

Show us how you play and it may tell us who you are

13 minutes ago

The ways animals play with inedible objects may be precursors of functional behaviors such as tool use and goal directed object manipulation. For these reasons, species of high technical intelligence are ...

Mars mission boost welcomed by scientists

18 minutes ago

University of Leicester scientists, who are closely involved in the European mission to Mars –ExoMars- have welcomed support from the Government for the project.

That's a bioplastic wrap

27 minutes ago

Bioplastics take on traditional petrochemical plastics in food packaging, with some challenges.

Companies do not use online HRM effectively

28 minutes ago

Professor Tanya Bondarouk of the University of Twente thinks it's embarrassing : many companies and organizations are still not making effective use of e-HRM systems. These online systems can be used for a wide range of HRM-related ...

Recommended for you

Consumer loyalty driven by aesthetics over functionality

3 hours ago

When designing a new car, manufacturers might try to attract consumers with more horsepower, increased fuel efficiency or a lower price point. But new research from San Francisco State University shows consumers' loyalty ...

Study: Alcatraz inmates could have survived escape

6 hours ago

The three prisoners who escaped from Alcatraz in one of the most famous and elaborate prison breaks in U.S. history could have survived and made it to land, scientists concluded in a recent study.

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.