This caterpillar is a unique look is mostly colored green and brown and at each end has a white ring shape that circles the purple-brown color on the back so it looks like a saddle. When fully grown, this caterpillar is about 1 inch long and 3/8 inches wide. This caterpillar also has a pair of fleshy horns on each end that contains feathers that remove toxins and along with spines that stand out in every direction. The sting is very painful and can cause swelling, nausea and a rash that lasts for a full day. Caterpillar Saddleback can be found in park areas, or flower pots, fields and / or forests. Eat it any thing from plants or gardens and trees and underbrush.