Brian did.
Brian found out what animal was in the shelter with him by feeling and seeing quills in his leg from a porcupine.
Brian finds shelter in a small rock overhang near the edge of the lake. He uses the hatchet to clear some of the brush and create a makeshift shelter with a fire pit and lean-to.
Brian's shelter in "Hatchet" was made out of a lean-to structure using branches, rocks, and his windbreaker for cover. He used natural materials he found in the woods to create a temporary and basic shelter to protect himself from the elements.
Brian found shelter by creating a lean-to shelter using branches and leaves. He found food by catching fish, gathering berries, and learning to hunt small animals. He also learned to start a fire with his hatchet, which helped him cook food and stay warm.
It broke it
Brian thinks that the bowl-shaped depression under the ledge was formed by a lightning strike hitting a dead tree. The lightning struck the tree, causing it to explode and leaving behind the depression that Brian has found for his shelter.
Getting a shelter
a skunk
The two cherries Brian found in "Hatchet" were tucked into a kind of greenery cluster he found while scavenging for edible plants around his shelter. He was overjoyed to find them as they provided a much-needed burst of sweetness in his otherwise meager diet.
Brian crawled out of his shelter because he heard a plane flying overhead and wanted to signal for help by making a fire.
Brian makes a shelter out of trees in the book "Hatchet" on pages 52-54.
In "Brian's Winter," Brian constructs a makeshift sled using tree branches and his jacket. He then ties the deer to the sled and drags it back to the shelter using branches as skis on the snow.