Leafy Spurge Hawk Moth Caterpillar

Can you tell me the name of this caterpillar?
We were out in Fish Creek, Calgary (Alberta, Canada) and came across this caterpillar. Can you tell me what sort of caterpillar this is. Thanks,

Hi Timothy,
This is a Leafy Spurge Hawk Moth Caterpillar, Hyles euphorbiae. In 1965, it was introduced from Europe to help control the invasive exotic plant, the leafy spurge. We will copy Bill Oehlke on this because he is compiling comprehensive data on species distribution.

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