This is a 'Leafy Spurge Hawk Moth' caterpillar. It was introduced in the 60's to help control leafy spurge outbreaks, with little success from what I see of the leafy spurge! Anyhow, this colourful guy was humping across the park road as quick as his many legs would take him. I stopped, took his pic, and then helped him across the road. He was too cute to let him get squished! He was 3-4 inches long! When they are in their early development, the caterpillars are green with black and white spots. First time for me to see one of these!
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