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Article
When a predator is not an immediate threat, a prey may produce relatively loud alarm calls because the risk is low. Since such calls could nevertheless attract acoustically oriented predators, the cost of predator attraction must be outweighed b[...]
Article
Recent non-experimental evidence suggests that reciprocal altruism may be more common in nature than was previously thought. Here we present experimental evidence for mobbing behaviour as reciprocal altruism in breeding Pied Flycatchers Ficedula[...]
