Which specific disease has historically caused catastrophic mortality events for Hoiho?
Answer
Avian diphtheria
Among the diverse threats facing the Yellow-Eyed Penguin population, disease stands out as a cause of severe, acute losses. Specifically, avian diphtheria has been documented as having historically resulted in catastrophic mortality events within the *Hoiho* population. Management strategies must account for this biological vulnerability, as disease outbreaks can rapidly decimate a small, fragile population pool.

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