A single cat may be a threat to one of Wellington's best known wild-life reserves.
The Department of Conversation is investigating a potential sighting of a feline on Mana Island.
Since the cat sighting, DOC has increased its surveillance regime, and deployed 14 motion detection cameras.
Wellington Biodiversity Ranger, Colin Giddy says they've also sent out a dog handler with three cat-detecting dogs to search for any sign.
Mr Giddy says the presence of a single pest could create devastating effects for the natural wildlife - particularly given the amount of threatened and endangered species on the island.
Mana Island has been pest-free since 1990.
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