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• PROTECTING NATIVE WILDLIFE - Ferrets kill adult kiwi, weka and ducks, while stoats have been found to kill nearly 100% of kiwi chicks before they reach maturity. Stoats are a threat to hole nesting species such as kaka, kakariki and yellowhead.
  
  
• REDUCING THE THREAT OF T.B. - 17% of ferrets in an Otago study had clinical signs of T.B. This means that over 50% were probably infected. T.B. has been found in ferrets elsewhere also.
  
  
• PROTECTING DOMESTIC BIRDS - Ferrets and stoats are such efficient hunters that they will kill entire clutches of ducklings overnight.
  
  
• PROTECTING GAME BIRDS - Gamekeepers are employed on some English estates to reduce the effects of mustelids (the family name for these species).