Cuadro de texto: Birth rate Cuadro de texto: Death rate Cuadro de texto: Minimal modification to make reproduction sensible to the environment (for example to external flows): 
Interacting bugs in which birth and death rate  depend on the number of other bugs within a distance R Cuadro de texto: N R(i) means the number of neighbors at distance smaller than R from bug i Cuadro de texto: In the following: a=0

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