The slug moth, or Acharia stimulea, is cutest in its larvae stage when it's the interesting saddleback caterpillar. This fuzzy brown bug looks like it's wearing a vibrant green saddle blanket. This unique creature is found mostly in eastern North America. If you happen upon one, don't be tempted to touch it or pick it up. The caterpillar's prickly spines are hollow and connected to poison glands underneath its skin, according to HGTV. That can result in a painful sting.