Porina are present throughout most of the country. When porina caterpillars hatch from the eggs, they live in the pasture and pasture litter for about five or six weeks, then burrow vertically into the soil, where they live during the day. At night they come to the surface and eat the grass around the burrow. They reach their full size of about 60–70 millimetres length in about August, when they pupate.
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