Large hawk-moth caterpillar from The Dordogne, France
No interactions present.
Prepupal, which is why it's that purplish colour, and why it's on the ground. The blue-green horn, lack of a yellow brush on the hind claspers, and the white striping would incline me towards Poplar or Eyed Hawk in the UK, but as this is in France there may well be more confusion species!
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Yes in this part of France there seems to be more lepidoptera than is really necessary I'm sure. Thanks for your assessment.
Biodiversity Officer - Shropshire
Have a look the last picture in the sequence of caterpillars here:
I don't know if it is found in the Dorgdogne.
Most likely I think is marumba quercus (oak hawk-moth) which is a common species here in the oak woods in Dordogne. Adults regularly turns up in our moth trap in mid summer. Perhaps poplar hawk-moth which is also present.
Lat/Lng: 44.8, 0.7