Check out the first sentence in the abstract of this recently-posted arxiv paper:

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Paper: cond-mat/0702584

Date: Mon, 26 Feb 2007 05:34:14 GMT (270kb)

Title: Modelling of self-driven particles: foraging ants and pedestrians

Authors: Katsuhiro Nishinari, Ken Sugawara, Toshiya Kazama, Andreas

Schadschneider, Debashish Chowdhury

Categories: cond-mat.stat-mech

Comments: 15 pages, 11 Postscript figures, uses elsart.cls

Subj-class: Statistical Mechanics

Journal-ref: Physica A vol.372 (2006) pp.132-141

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Models for the behavior of ants and pedestrians are studied in an unified way

in this paper. Each ant follows pheromone put by preceding ants, hence creating

a trail on the ground, while pedestrians also try to follow others in a crowd

for efficient and safe walking. These following behaviors are incorporated in

our stochastic models by using only local update rules for computational

efficiency. It is demonstrated that the ant trail model shows an unusual

non-monotonic dependence of the average speed of the ants on their density,

which can be well analyzed by the zero-range process. We also show that this

anomalous behavior is clearly observed in an experiment of multiple robots.

Next, the relation between the ant trail model and the floor field model for

studying evacuation dynamics of pedestrians is discussed. The latter is

regarded as a two-dimensional generalization of the ant trail model, where the

pheromone is replaced by footprints.

\\ ( http://arXiv.org/abs/cond-mat/0702584 , 270kb)

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Maybe the sequel will be about glomming? Flocking and swarming are pretty hot topics these days...