Investigating the 'dear enemy' phenomenon in the territory defence of the fiddler crab, Uca mjoebergi
Territory owners often respond with greater aggression to strangers than to neighbouring individuals, a phenomenon known as the 'dear enemy' effect. As strangers are usually 'floating' individuals seeking to acquire a territory they pose a relatively greater threat to a resident than do neighbours, who are already territory owners. This explains why residents are less aggressive towards neighbours but not how they distinguish neighbours from strangers: do residents recognize their neighbours or...[Show more]
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