Caterpillars – the shapes and sizes that they come in and for many the urge to touch, pick up and hold is almost irresistible. Yet although most butterfly and moth larvae are quite harmless, preferring to curl up in a ball when threatened, some will make it quite plain that they do not like to be touched. They will sting: here is a selection of the stinging caterpillars of the United States.
The saddleback moth caterpillar,
Sibine stimuli, pictured above has a 'face' that scares off many a potential predator. Yet it will also send you a definite message that it is unhappy with your sticky fingers on it. In a purely defensive tactic it will give you a sting that will dissuade you from picking up another. You can see the ‘horns’ that the caterpillar has on each end of its body – these are barbed spines which are also known as urticating setae.
