The squirrel is a recurring animal throughout the series.
At the beginning of the opening sequence, a camera pushes a squirrel out of a hole in a tree. Soon after, squirrels are seen peacefully sitting by DJ. This continues until a fish falls on him, causing the squirrel and several other animals to attack him, even though he is supposed to be an animal lover.
In The Sucky Outdoors, the squirrels make fun of Katie and Sadie when they get lost in the woods by mimicking their argument, mouthing the words, and making the faces. The squirrels also laugh a little as they do so.
In X-Treme Torture, early in the morning, an annoyed squirrel smacks a tweeting bird off a tree.
In Search and Do Not Destroy, a squirrel is seen coming out of the tree with a cup of coffee at the beginning of the episode.In Hide and Be Sneaky, Gwen punches a squirrel, who is near her hiding spot, before it can reveal her location to Chef who is hunting the contestants to eliminate them from the challenge. Later, when Geoff climbs a tree, an acorn falls off it and knocks out a passing squirrel.
In Camp Castaways, a squirrel is seen floating away from the island, on top of a submarine.
In Dial M for Merger, a squirrel is seen falling into the tomato bath, in which the cast is sitting in after smelling their stench.
In Aftermath: Bridgette Over Troubled Water, the squirrel makes a brief appearance in the aftermath in a never-before-seen clip of Harold's "best" moments. It is also seen punching Harold in the face, with its fist enlarging to a much greater size, after it becomes annoyed with his stream of trivial facts.
In Aftermath: Revenge of the Telethon, the squirrel is seen during the "DJ's World of Animals" segment, in which a clip is shown of DJ feeding a squirrel food in Central Park, when a bicycle suddenly runs it over, squishing it to the ground.
During Dawn's audition tape, a squirrel appears on a branch nearby. She takes it in her hand and explains that she's going to use her money to help Mother Earth. The squirrel then is taken away by an eagle, shocking her.
When Camp Wawanakwa becomes radioactive, the squirrel is now heavily mutated. In addition to losing its hair, the squirrel's eyes blink vertically opposed to horizontally, its tongue being extremely long, and it now has the ability to shoot lightning-like bolts from its eyes. In addition, it became either a carnivorous or omnivorous animal, as it eats a butterfly.
In Bigger! Badder! Brutal-er!, when the contestants first arrive to the island, they think they are being chased by a large monster, but it turns out to be a squirrel. Dakota later tries to pet the squirrel, wanting to keep it, but it proceeds to shoot electrical bolts at her. During the first challenge, while Brick tries to pull an axe from his team's totem, the squirrel appears again. After being agitated by Mike, the squirrel shoots more electrical bolts from its eyes, cutting down the Mutant Maggots totem, giving them a lead in the challenge.
In Runaway Model, a squirrel is seen hanging around in some scenes and joining in on the mutant animal fight in the woods.
In Eat, Puke and Be Wary, a squirrel appears in the beginning of the episode, disintegrating three birds with electrical bolts. Later, a few of them attack Cameron, while he is looking for ingredients to cook his dish.
Another squirrel appears in The Enchanted Franken-Forest eating the giant fly that is trying to kiss Cameron.
A squirrel appears in Brain vs. Brawn: The Ultimate Showdown, along with the other mutated creatures. It shoots Anne Maria's hair with its electrical bolts; however, Ezekiel throws it aside and saves her.
In Saving Private Leechball, Sam encounters a squirrel in a tree on Boney Island, while trying to avoid the animals trying to get him. The squirrel then throws a nut at Sam, knocking him into the angry horde.
In Moon Madness, while under the effects of the Blue Harvest Moon, the squirrels on the island have become ferocious, even attacking a bear at one point.
In The Final Wreck-ening, when the island is sinking, a squirrel is seen holding up a sign showing the world falling apart, laughing hysterically. It is then later seen with the other animals, escaping in the Boat of Losers.
This season features a new contestant named Ella, who has the ability to charm any animal by singing. One of these animals is the squirrel, which is commonly seen near her when she sings.
In A Blast from the Past, a squirrel is seen running away at the beginning of the episode when a creature covered in seaweed emerges from the lake.