We extend our study of single and collective motions of the zooplankton Daphnia both in experiment and computer simulation. Daphnia, as well as many other prey animals, can be observed to swarm under certain circumstances as a protective behavior against predators. Daphnia swarms can be induced...

We revisit, by means of Monte Carlo simulations and scaling arguments, the growth model of Bunde et al. (J. Stat. Phys. 47(1987)1) where growth sites have a lifetime τ and are available with a probability p. For finite τ, the clusters are characterized by a crossover mass s×(τ)∝τφ. For...