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Revealed: The mystery behind starling flocks
Date:7/18/2014

The mystery behind the movements of flocking starlings could be explained by the areas of light and dark created as they fly, new research suggests.

The research, conducted by the University of Warwick and published in the journal PNAS, found that flocking starlings aim to maintain an optimum density at which they can gather data on their surroundings. This occurs when they can see light through the flock at many angles, a state known as marginal opacity. The subsequent pattern of light and dark, formed as the birds attempt to achieve the necessary density, is what provides vital information to individual birds within the flock.

The dynamic pattern of light and dark is created by birds within the flock altering the positions and angles at which they fly, causing a change in the amount of light let into the flock. The researchers observed that it was always possible to see areas of light coming through the flock, providing the initial insight that the changing patterns of light and dark had a role to play in the flock's movement.

This insight led to the development of a computer model in which individual birds with simulated intelligence were attracted to the areas in the flock that could provide the most information on the rest of the flock . When each simulated bird was attracted to the areas in the virtual flock that can provide the most information the result was a cohesive swarm.

The Warwick team then applied the model's findings to flocks in the wild and established that there was a strong correlation between movements of the virtual and natural birds.

"An individual starling within a flock can see in front of them areas of light and dark created by other birds, forming a dynamic and changing silhouette", says lead researcher Daniel Pearce from the University's Department of Physics. "Our research ascertained that the silhouettes we external observers witness were a result of large flocks self-
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Contact: Tom Frew
A.T.Frew@warwick.ac.uk
44-024-765-75910
University of Warwick
Source:Eurekalert  

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