Narrow living space Fluffy mister grass + shiny shiny treasure + stored food
A soft tunnel carved out using teeth and sticks
[Left side] Grass and flowers.
[Yukkuris] Mother Reimu takes care of the little ones by feeding them, singing to them, and taking care of their toilet needs.
Father Marisa hunts, fights off enemies and does construction work.
[middle]
The territory range of the yukkuri is about 3 meters in diameter. The manju skins will tear on the rocky mountain roads and they will not be able to come back. If they leave this range they will also get lost and not be able to come back.
[Bottom] One day when the food ran out, they venture forth a few meters extra towards a new easy place.
[Right] When it's getting dark, Marisa has no choice but to dig a home. Little ones and the mother cheered on the side.
If their territory is that small, then only moving around the corner is actually pretty smart. Though it sounds like here they didn't plan it that way, it was more of a "getting dark ohshitohshit gotta live here."