Found a Neon Green Grub: Antheraea Polyphemus Moth/Larva Photography
In the fall, these larvae drop down from their trees and find a place to cocoon. 
The polyphemus moth larvae primarily feed on oak trees in this region.
Some of the cocoons will hatch in the same season, producing multiple broods of moths in a single season, but most of the ones that are still larvae this time of year will overwinter as cocoons and hatch next Spring.
These are all my photos, of the same species, Anthereaea Polyphemus, adult moth and larva. I've made some of these photos usable under creative commons, it still feels weird to see an article someone wrote that uses one of my images as the cover. This last image of mine is still the cover for the wikipedia page for this species as well: https://en.wikipedia.org/wiki/Antheraea_polyphemus
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All images are my own
Nikon D3400 - images 1 and 2.
Canon S110 - image 3
Samsung HZ10W - image 4
Photography © @kadoka
howdy there kadoka! wow that's so interesting to see a bright green grub and then the moth that it turns into is beautiful which is surprising. All the moths I've seen around here are ugly! lol. great job though, do you specialize in wildlife photography?
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Really well done pictures, congratulations!
What a beautiful color of the larvae! And that moth is so pretty too! They can be so colorful and fluffy :)