Identificaciones de allenhc

After finding the bluebird feather in a heavily burned area, I ventured out into a less populated grassy area, that's only inhabitants were towering trees and small bushes, compared to where I found the bluebird feather, which was heavily densified by trees, bushes, shrubs, small plants, and grass.

I searched the surrounding area thoroughly, but this was the only feather of any bird that I could find. It was laying under a burned tree, that was sprouting with new growth. It was very small, and when I picked it up, the wind swiftly knocked it away from me, never to be seen again. The feather was roughly 5 centimeters in length.

Found in pond water attached to reeds near bank. Dark brown spiral shell covered in ridges. ~1 inch diameter. Dark brown, wet, moving foot visible, no eyes visible. One other was spotted within 6m. Wet flesh exposed around center of spiral of shell.

Apologies for the poor image quality and grain. Observed around twilight. I increased the exposure and brightness on these photos after they were taken.
At least 2 individuals were visible at the time, possibly 3.
All photos are believed to be of the same individual.
Roughly house cat sized, observed seemingly digging at least one hole and eating plums off of the ground.
This individual came within at least 2 meters of the camera multiple times and seemed to indicate curiosity. It was not aggressive, but not shy either. No audible sounds were made by any foxes other than quiet rustling. These animals seemed to remain relatively calm.
They seemed relatively small for gray foxes, so they may be younger.
Scat appeared at least 4 days prior to observation. Scat is in the same immediate area as observation. Scream-like non-human noises were heard in the same area around 7 days before these animals were spotted. Shallow holes/burrows were found as well. I don't have any photos of said holes, however I can add some in the near future if necessary.
I am fairly sure of the species.

2 were spotted calling each other, within 200 meters of each other. each was about 6 inches.
Seen in walnut tree in grassland, within 50 meters of oak woodland. Holes had acorns inserted in them and were around 3/4 inches in diameter.
2 feathers were spotted within 5 and 20 meters of the tree.

Found in ashy, burnt patch of soil under partially burnt tree. Observed in grassland, within 100 meters of oak woodland. Matched the color of the ground.
Other, lighter colored grasshoppers believed to be of the same species were observed in tall grass ~5 meters away from burnt earth.