The Caterpillar was on a blade of grass
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Welcome to iSpot, Alan. I see that your farm is in Oregon, USA. Hopefully someone with knowledge of lepidoptera in your part of the world can help ID this caterpillar for you.
University of Edinburgh and Biodiversity Observatory (OU)
I think the "Oregon" on the map is a settlement not the state of the same the name - the location seems to be in Illinois.
The caterpillar could well be Malacosoma americanum (Eastern Tent Caterpillar Moth) - lots of pictures here:
and distribution map here
Yes, you are right on both accounts. It is Illinois and I think that you are correct that i is the "Malacosoma americanum" . Thank very much, I had heard about iSpot on a BBC Radio 4 (Pod Cast) a big improvement over Facebook.
Lat/Lng: 41.907381447487, -89.652763903141