Staff at Dunedin's Botanic Garden are concerned about the growing popularity of a drinking game called "possum", in which participants sit in trees and drink large amounts of alcohol.
According to the website Urban Dictionary, "possum" is a "drinking game in which players have to sit in a tree, like possums, and consume a pack of 24 beers ... until they fall out of the tree from drunkenness".
Dunedin City Council gardens and cemeteries team leader Alan Matchett said staff first encountered people - believed to be mainly students - playing the game about four years ago.
Since then it had increased in popularity to the point where it was "not uncommon" for gardens staff or security guards to have to chase away people who were playing the game.
Mr Matchett said his understanding of the game was that a number of people climbed a single tree, taking with them large amounts of alcohol and sometimes food.