Overview
- University of Canterbury researchers reported in Current Biology on Monday that Bruce, a kea missing his upper beak, is the top male in his Willowbank group.
- Over four weeks they logged 227 conflicts, including 162 between males, and Bruce won all 36 male bouts he entered.
- He displaced rivals by thrusting his exposed lower beak like a spear, a move other kea cannot copy that worked about 73 percent of the time.
- Dominance brought perks measured in the study, including first arrival at central feeders 83 percent of the time, grooming from subordinate males, and the lowest stress‑hormone metabolites in his droppings.
- The authors caution that the results reflect captivity and raise questions about prosthetics, while Bruce’s earlier pebble tool use highlights kea problem‑solving in an endangered species.