caterpillar• Just as only a caterpillar can become a butterfly, the formal stage seems a necessarydevelopmentalstep to the skilful stage.• In the Washington area, cabbages are vulnerable to two persistentpests: Aphids and cabbage mothcaterpillars.• The old caterpillar skin peels back and falls away.• When I arrived at the page on caterpillars, again I read the boldheadings.• It may take as long as a week for all the caterpillars to make their chrysalises.• As the wasphovered near, the caterpillars suddenly started flailing from side to side.• The caterpillars can be picked off, but their coloring makes them difficult to see, especially when they are small.