Identification of Damage Cause

I am wondering specifically if it is possible to identify what creature might be responsible for this particular damage to my two inch pea shoots. Once I know what it is, I can take the proper steps. I'm a novice, so I don't readily know it yet.
Thanks!

 

The leaf litter screams of squirrel, but other rodents like rabbits could have done this. A squirrel might have dug into the dirt a little or pulled the sprout out of the ground, but rabbits take thoughtful nibbles of only the tenderest bits if they can. It's hard to tell for sure at this stage. I don't think it's something like deer, and it doesn't look like raccoon or opossum damage.

 

I find the lowly woodlouse to be big culprit of chewing off leaves.....just lost my cucumbers seedlings to them

"Woodlice are, in fact, a kind of land going crustacean! Their segmented bodies are flattened versions of the basic prawn anatomy. While they are adapted to life on the land, they still need moist conditions in which to live and breathe through their specialised dry gills. For this reason they are mostly active at night or in permanently sheltered and humid conditions such as under mulch and in compost and rotting timber. Unfortunately, the thick mulching and heavy compost use associated with good organic gardening provides Wood Lice with perfect conditions! And they can also become a problem in greenhouses due to the favorably permanently moist conditions. Some are specialized compost bugs that only eat fungus and cause no problems for the organic grower, being an integral part of your composting system. Others will also attack soft plant tissue, such as gnawing through the stems of young seedlings, which is the chief way they antagonize organic gardeners."

 

I recently found that in my garden too. It turned out to be slugs. You can screen the plants from critters, but slugs and pill bugs require other methods.

 

If it is slugs you should see a slime trail....if no trail, most likely the woodlice aka pill bugs

 

Ha! I've only known them as detritivores. With the cross continental difference and wide variety of species in the world, it's certainly possible that yours in PNW do eat fresh bright green plants. However, I'd call your attention to the bit of pea plant petiole that is just above the ruined plant in the photo. I'm having fun imagining muscular pill bugs tag-teaming the pea leaf at opposite ends of the petiole, and when they've had their fill they heave the remnant four times their body lengths away. Also considered slugs, but wanted to see evidence of their slime anywhere in the photo. Plus, I think they would have at least gnawed a bit of the stem as an appetizer.