Overview
- A Current Biology paper published Monday confirms that Bruce, a kea missing his upper beak at Willowbank Wildlife Reserve in Christchurch, ranks as the group’s alpha male.
- Researchers report he uses a novel beak‑jousting move that thrusts his exposed lower beak to jab rivals, a tactic intact birds cannot replicate.
- Across four weeks, observers recorded 227 conflict events, including 162 male‑male contests, and Bruce won all 36 of his engagements with a 73 percent displacement rate for jousts.
- Hormone tests on droppings showed Bruce had the lowest levels of stress‑related glucocorticoid metabolites among the males.
- Experts caution it is unclear whether his dominance would hold in the wild, where food gets tougher in winter and kea groups change more often than in captivity.