Sphinx Moth (caterpillar)

Laying on ground plants. Black with yellow spots, red face and red tail, approximately 3″ inches long. Yours looks like it might be big enough that it is roaming to find a place to pupate.Caterpillars of this moth do vary some in color, but like most sphinx caterpillars they have a ‘horn’ or tail on the rear end. This insects horn is either red or black.