SilverWolf
Veteran
That scared me so much. I hope I never see that in real life.
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The spines, hidden among the hairs, are hollow, and release a toxin of unknown chemical composition that produces a skin lesion. The lesion usually begins as a halo of reddened skin surrounding the sting site. This is soon followed by the appearance of a number of small cysts that gradually develop into a matrix of blood-filled lesions where the mass of spines punctured the skin.
the caterpillar does not have to be alive to "sting" you. The hollow spines, filled with toxin, will continue to cause painful stings hours long after the insect has been killed.
These caterpillars have been called by several names, including puss caterpillar, wooly worms, wooly slugs, opossum bugs, tree asps, and, in Mexico, el perrito (little dog).