Visitors to Auckland Zoo's kiwi enclosure the "Night Forest" were evacuated today after staff smelled smoke through the building.
Three fire appliances and the hazardous materials unit attended after the chemical smell was noticed.
No fire was found and fire officers later discovered there was a leak in a refrigeration unit.
Jooles Clements from Auckland Zoo said visitors were evacuated immediately.
"As soon as staff noticed the smell they have evacuated the building and followed the safety process," he said.