Definitely no crows in NZ but we do have magpies which are a crow species and they are very intelligent. They know team work, a single magpie is no match for a hawk but two magpies working together can see off a hawk. I see this scenerio many times over my farm.
Magpies are also very territorial and I have a resident pair here, no good bumping them off, they would be immediately replaced by another pair. They are very cheeky and will come onto the patio and eat out of the cat dishes.
This guy who studied crows in (French) New Caledonia got $650,000 from the NZ government to do this. I don't think the government knows we don't have crows. I'm going to put in for a research grant to see if NZ kangaroos are more intelligent than Aussie kangeroos. No, we don't have them either but the government probably doesn't know that and for $650,000 I'm going to tell them.
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Ride on !