During the construction of new classrooms at Mount Cotton State University, builders discovered the world's heaviest insect, the giant wood moth.

According to the entomologist, nothing was known about the first year of the larval period, which lasted about three years. Female adult moths can grow to be up to 15cm long.

The Queensland Museum said that there are about 60 species of wood moths in Australia, but not all are as large as the giant wood moth, and not all feed on eucalypts.

Before returning the moth to the rainforest, the builders took a picture of it.

After seeing an image of a moth, the year 4-5 class in the new building was asked to come up with a creative writing idea and agreed to write about a moth invasion. Steward said, "The students wrote some very artistic, innovative pieces of poetry, including Mrs. Wilson being eaten by the giant wood moth."

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