The puss caterpillar, found in the Americas, appears harmless with its fluffy exterior but harbors venomous spines beneath. Its sting causes intense pain, swelling, and potential systemic effects. This deceptive creature eventually transforms into the innocuous southern flannel moth, highlighting nature's intriguing transformations.The puss caterpillar, found in the Americas, appears harmless with its fluffy exterior but harbors venomous spines beneath. Its sting causes intense pain, swelling, and potential systemic effects. This deceptive creature eventually transforms into the innocuous southern flannel moth, highlighting nature's intriguing transformations.