Caterpillar ID

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It might be helpful if you can say what state you reside in, also the approximate length of the caterpillar (it looks huge).
 
You made me bust out the Audubon book lol.

It appears to be a spanworm, though I'm not sure what kind. This would make it the caterpillar of a moth. Even after getting a rough idea from the book, I wasn't even able to narrow it further from the internet without knowing the location.
 
Maybe it is a EUPITHECIA MAESTOSA, a clearer photo highlighting the head and any other differences might be helpful.

Check out THIS PDF from the forest service for moths and butterflies from the southwest U.S. for great photos and pics of the caterpillars and the adult insects.
 
Maybe it is a EUPITHECIA MAESTOSA, a clearer photo highlighting the head and any other differences might be helpful.

Check out THIS PDF from the forest service for moths and butterflies from the southwest U.S. for great photos and pics of the caterpillars and the adult insects.

+1

Eupithecia_graefii_catrbk.jpg

Eupithecia_graefii_catrbk.jpg
 
Maybe it is a EUPITHECIA MAESTOSA, a clearer photo highlighting the head and any other differences might be helpful.

Check out THIS PDF from the forest service for moths and butterflies from the southwest U.S. for great photos and pics of the caterpillars and the adult insects.
+2
 
Actually after looking through all the pictures on the link I provided, you will need to check more of the photos and do a better comparison. There are some fine details between the green caterpillars that may make it easier to differentiate when you compare yours to the pics. Head shape, white markings, 'tail' shape, etc are difficult to see in the OP's pictures.

I was just guessing on the ID after a quick look through the link. I wish the link provided the sizes for the caterpillars as that would be more definitive.
 
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