In early January, the $1.2 million tropical rainforest, which is housed in a 240sq m, three-level facility, broke the museum's previous 50,000 attendance record for a paid entry show.
"Chinese Dinosaurs", a touring show of ancient fossil dinosaurs from China, attracted about 50,000 people to the museum over a 10-week period in 2003, establishing the previous record.
By late last week, about 160,000 people had visited the forest, which remains about 28degC irrespective of the time of year, and is home to about 1000 brightly-coloured butterflies.
Helen Horner, director, programmes, said several hundred people, including many youngsters, flocked to the forest yesterday when the facility's anniversary was celebrated with cupcakes decorated with butterfly-shaped jellybeans and brightly coloured balloons.
Museum chief executive Shimrath Paul said museum staff were delighted by the sheer diversity in age of the people.
