This Caterpillar initially attaches four sticks around its case, all of the same length, and attaches them at right angles to the axis of the case. When the Caterpillar grows sufficiently long, it attaches a new set similarly arranged to the old set, except that they are slightly longer, so that the radius of the new part of the case is bigger aligned with the previous four. So the case grows like a pyramid.

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Australian butterflies

Australian caterpillars

Australian moths

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(updated 22 April 2011)