We tend to think of caterpillars as cute, innocent little bugs who are, at worst, garden pests. But not all future moths and butterflies are so defenseless. Some have stinging or itching spines that can leave you irritated for weeks after contact.
The Ark In Space has a great piece on the different varieties of stinging caterpillars in the United States. If you live in the states, the article could help protect you against any potentially painful encounters with the little bugs. If you don't live in the U.S., the article still might be worth your while just for the fantastic pictures.