Be careful – processionary caterpillars can harm you! Processionary caterpillars (and possibly other hairy caterpillars) are urticarial, meaning that they cause variable levels of allergic reaction in people who are exposed to nest material or the hairs (setae) of the caterpillar. Contact with skin can cause wheals and widespread rashes (Figs 1 & 2) that … Continue reading Health precautions and tips