Parasites have been known to induce behavioural changes in their host' and of interest is whether these behavioural changes are a product of evolution benefitting the parasite or are merely side-effects of an intense infection. If evolution is in play, parasites with complex life cycles would be predicted to alter behaviours in ways that increase the chance the parasite will reach the next host in their life cycle, such as inducing risky behaviour that increase predation rates by the next host.
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