SYDNEY, AUSTRALIA - JUNE 27:  Two Cairns Birdwing butterflies sit together during the opening of the interactive butterfly habitat 'Flutterbys' at Sydney Wildlife World June 27, 2007 in Sydney, Australia. The two-storey habitat allows visitors to interact with butterflies in a tropical rainforest setting of 30 degrees celsius and 70% humidity. Getty Images logo Getty Images 29 months ago

SYDNEY, AUSTRALIA - JUNE 27: Two Cairns Birdwing butterflies sit together during the opening of the interactive butterfly habitat 'Flutterbys' at Sydney Wildlife World June 27, 2007 in Sydney, Australia. The two-storey habitat allows visitors to interact with butterflies in a tropical rainforest setting of 30 degrees celsius and 70% humidity.