What animal will dig up and eat entirely a yellow jacket nest can also reach hornets 3 feet off ground on underside of deck?

The animal you're describing is most likely a badger.

Here's why:

* Digging: Badgers are known for their powerful claws and digging abilities. They can easily excavate yellow jacket nests, which are typically underground.

* Diet: Badgers are omnivores with a varied diet, and they include insects like wasps and hornets in their meals.

* Reach: Badgers can stand on their hind legs to reach higher spots, allowing them to access hornet nests on the underside of a deck.

While other animals like skunks, raccoons, and bears might also raid yellow jacket nests, the combination of digging prowess, insectivorous diet, and ability to reach higher areas makes badgers the most likely culprit.

Important Note: If you encounter a yellow jacket or hornet nest, it's best to leave it alone and contact a professional pest control service for safe removal.