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Interaction patterns among 19 spiders in an experimental colony of marked individuals. Darker colours represent bolder individuals and the boldest individual in the group is denoted by a star. The assortativity value of this network is −0.1 which is more disassortative than random at a probability of 0.0001. That is, individuals were more likely to interact with others of different boldness phenotypes than expected at random. (Online version in colour.)
