Megalopyge opercularis
This caterpillar is highly dangerous due to its venomous spines. Exposure to this caterpillar's fur-like spines leads to an immediate skin irritation. The pain is similar to bee, wasp or hornet stings. The reactions are often localized to the affected area. However, the reactions are usually severe. The reaction causes burning, nausea, headache, rashes, vomiting and blisters.