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26 November 2008

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POSTSCRIPTO- Unintentionally appropos: Daruka, I (2008) A phenomenological model for the collective landing of bird flocks.  Proceedings of the Royal Society, B DOI: 10.1098/rspb.2008.1444.

Abstract:  A three-dimensional phenomenological model was developed to describe the collective landing of bird flocks. The employed individual based model included the landscape (as an external field) and a continuous internal variable G, to characterize the landing intent of the birds. The birds’ interaction with the landscape was coupled adaptively to their landing intent. During the flight, a sharp crossover is observed in the dynamics of the landing intent, i.e. from the initial, non-landing state (small G) to the landing state (large G) that was terminated by the landing of the flock. In the model, the landing process appears to be a highly concerted, collective motion of the birds, in agreement with the field observations.

sweet.

2 Responses to “/”

  1. Jeremy Says:

    and did this (my above link) happen? I think it does, all the time. wish it was videoed more often. When i see that i think of what i thought i remembered reading about the behavior that David Bohm thought was curious of plasmas
    i welcome others to rewrite my sentence.

    (oh, i searched and found it – “a highly organized and cooperative behavior called plasma oscillation” [from an interview introduction])
    I guess the birds in my link are like my mental image for ‘organized and cooperative’

  2. Neil Says:

    “In the autumn of 1813, I left my house at Henderson, on the banks of the Ohio, on my way to Louisville. In passing over the Barrens a few miles beyond Hardensburgh, I observed the Pigeons flying from north-east to south-west, in greater numbers than I thought I had ever seen them before, and feeling an inclination to count the flocks that might pass within the reach of my eye in one hour, I dismounted, seated myself on an eminence, and began to mark with my pencil, making a dot for every flock that passed. In a short time finding the task which I had undertaken impracticable, as the birds poured in in countless multitudes, I rose, and counting the dots then put down, found that 163 had been made in twenty-one minutes. I travelled on, and still met more the farther I proceeded. The air was literally filled with Pigeons; the light of noon-day was obscured as by an eclipse, the dung fell in spots, not unlike melting flakes of snow; and the continued buzz of wings had a tendency to lull my senses to repose.” — J.J. Audubon on Passenger Pigeons


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