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They were all found in the Water of Leith along with dozens of beer bottles, cans and other refuse during a clean-up near the University of Otago yesterday.
The Dunedin South Rotary Club, Dunedin Rotaract Club and about 220 students from St Margaret's College spent about two hours cleaning the waterway between the Botanic Garden and the Anzac Ave overbridge by Forsyth Barr Stadium.
For some of the students it was all fun and games until they slipped on wet rocks and ended up submerging themselves in the murky water.
''I just went out for a little swim, accidentally,'' St Margaret's College resident Liri Salz said.
''But that's all part and parcel of the fun we've been having.''
Fellow resident Alexandra Hanaray said it was a great opportunity to get to know their fellow residents, build teamwork skills, and give back to the local community.
''Every day we walk past this place to go to lectures and sometimes it's an eyesore.
''After it gets cleaned up, it's gorgeous, but half the time it's not, which is really sad.''
Dunedin city councillor and Rotary Club of Dunedin South president Andrew Whiley said it was the second time the community had come together to clean the Leith.
''We did this last year and we pulled couches and tyres and all sorts of stuff out.
''It's dramatically better this year. Last year's clean-up had an impact.
''People now appear to be thinking twice before throwing things in there.
''They look at the environment, they see how clean it is, and they don't want to be the first person to put something in it.''
He hoped there would come a day when little to nothing was pulled from the waterway.