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Success in territorial defence by male tarantula hawk wasps Hemipepsis ustulata: the role of residency

1. Some male tarantula hawk wasps Hemipepsis ustulata defend landmark shrubs growing on mountain tops, while others only visit a succession of territory sites, generally fleeing from territorial males. To determine whether residency asymmetries contribute to the short duration of most interactions between territorial males and visiting intruders, established residents were held captive for varying periods while other males replaced them at their territories.