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Last are the mammals, from the mightiest Javan rhinoceros to the meekest mountain pygmy possum.

Alpine species such as the mountain pygmy possum have life cycles built around winter snow, while many of the world's cities rely on snowmelt for their water supply.

The pygmy possum mother, her litter of babies, and the two- to three-inch gecko were not just passing through.

This may even explain why the gecko decided to live with the pygmy possum family.

Euan Ritchie, a professor in wildlife ecology and conservation at Deakin University in Melbourne, said that “the pygmy possum has made a nest out of all these leaves and twigs, which is exactly the sort of habitat that reptiles like.”