The saddleback caterpillar, is the larva of a species of moth native to eastern North America. The species belongs to the family of slug caterpillars, Limacodidae.
The caterpillar is primarily green with brown at either end, and a prominent white-ringed brown dot in the centre which resembles a saddle.
It also has a pair of fleshy horns at either end.
Though the bright green "saddle" makes you want to take a closer look at the saddleback caterpillar, don't be tempted to pick it up. The saddleback's spines protrude in nearly every direction.
The caterpillar will arch its back to get as many spines into you as possible, and its spikes secrete an irritating venom, so maybe it's best to stay out of its way until it turns into a moth!