Dunedin's parks and reserves, including the Dunedin Botanic Garden, risk becoming a colonial relic and need to better represent the knowledge and promises of the Treaty of Waitangi, an academic says.

Columba College staff have been left "devastated" and "bewildered" after the school announced its absent principal will not be returning.

A pungent and foul "rotten egg" smell has left residents of a Dunedin suburb plugging their nostrils.

A third youth has been arrested after an allegedly stolen car, spiked three times by police, was driven on its rims through Dunedin, sending sparks flying.