What is the kangaroo population in Australia?
Kangaroo industry
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Each kangaroo taken by licensed harvesters must have such a tag fixed to it and the harvester and processor must report back to the authorities on a monthly basis the details of the exact number of the tags they have used, where the tags were used, and what species, sex and weight of animal to which they were attached.  The authority monitors the release and use of tags to ensure the harvest in any one area does not exceed the quota.