No, but these caterpillars have spiny urticating hairs. These hairs can cause a sting if you touch them. Caterpillars with urticating hairs are infamous for causing stings and allergies and can cause pain, rashes and other discomforts if touched by accident. Moreover, these caterpillars often end up in bunches (because their eggs are laid together), so it is very easy to touch one of them by mistake.