Puss caterpillar

Photo of a puss caterpillar

Source: Public Health Image Library (PHIL). Richard F. Darsie Jr., PhD. Available online: http://phil.cdc.gov

The puss caterpillar, or woolly slug, is the most poisonous caterpillar in the United States. Its poison is hidden in hollow spines among its hairs. This hairy caterpillar is found in the southern states, ranging west through most of Texas and north to Maryland and Missouri. It feeds on shade trees such as elm, oak, and sycamore. Puss caterpillars vary in size from 1.2 in. (32 mm) to 1.4 in. (36 mm).

Last Updated: January 26, 2010

Author: Jan Nissl, RN, BS

Medical Review: Martin Gabica, MD - Family Medicine & Sean P. Bush - Emergency Medicine, Envenomation Specialist & H. Michael O'Connor, MD - Emergency Medicine

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