The Department for Enterprise says it hasn't done a specific risk assessment about the threat wild wallabies pose to the TT races.
A Freedom of Information request asked for the risk assessment to be released, saying there are 600 feral wallabies living near Quarry Bends in the northwest part of the course.
In response, the department said although it didn't specifically mention wallabies, a risk assessment for the whole course includes livestock and wild animals.
It adds trained and competent marshals and race control staff help mitigate the risk.
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