It's a tomato hornworm. I've only seen a couple in the past 20 years. They both had a bunch of little cocoons sticking out of them. The cocoons were those of a parasitic wasp that lays it's eggs on the hornworm. When the eggs hatch, the larvae burrow into the hornworm and eat it from the inside out. So, if you ever see one like that don't kill it.
Scroll down to the 4th picture of tomato hornworms to see the cocoons.

The tomato hornworm is the larva of the moth known as the sphinx, hummingbird, or hawk moth. They appear at dusk in May or June, and I personally have mistaken them at times for hummingbirds as they too pause in the air to sip nectar.

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Terry

May the force be with you