speed,
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, spreading across 400 birds in a little more than half a second,
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, Cavagna and his colleagues report July 27 in Nature Physics,
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. That’s too fast for the diffusion scenario to work,
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.








To develop a mathematical explanation of how flocks turn, researchers recorded groups of starlings flying above Rome. The team then simulated each bird’s three-dimensional trajectory (axes shown in meters). A few birds lead the turn,
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, the researchers found, and the information about changing direction reaches all birds in a little more than half a second
A,
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. Attanasi et al/Nature Physics 2014




This is a “really extraordinary experimental observation,” says physicist William Bialek of Princeton University, who was not involved in the study. Another problem with diffusion,
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, he says,
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, is that it assumes that if

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