Australasian harrier (harrier hawk) (Circus approximans) are a Schedule 3 bird (in the Wildlife Act ) and you can get permits to kill them. Very common.
If it were the NZ Falcon then DOC ay be interested. https://www.doc.govt.nz/nature/native-animals/birds/birds-a-z/nz-falcon-karearea/ . No one should knowingly shoot those.
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