Buck Wild

Buckminster "Buck" Wild is a weasel that appeared in "". He is missing his right eye and wears a leaf as an impromptu eyepatch, as well as having a scar on one of his ears and seems slightly insane (he claims that he woke up one day, married to an ugly pineapple, but he still loved "her", and Manny calls him a "deranged hermit." He also claims to have sadly been "killed by Rudy," although he was not). According to the official website, Buck is one-eyed and relentless in his hunting for dinosaurs. Buck's archenemy is a large albino Baryonyx he calls Rudy, who gouged out Buck's eye and attempted to eat him, but failed after Buck grabbed onto to Rudy's uvula, swung on it, and then let go, knocking out Rudy's teeth, which he kept and later sharpened into a knife that he carries with him. Buck is the only inhabitant of the dinosaurs' world who does not fear Rudy in the slightest, though he possesses a deep respect for him. Due to living underground for so long, he has an extensive knowledge of the dangers of the dinosaur world.
Buck first met Manny, Crash, Eddie, Diego, and Ellie (who he at one point refers to as "preggers") after they descend into the jungle in pursuit of Sid and Momma, and saves them from a dinosaur attack. He has been living in the jungle for quite some time, persistently hunting Rudy to avenge the loss of his eye, and agrees to lead them to Lava Falls, where Momma has taken Sid, and rescues him after taking control of a Harpactognathus. After Rudy's potential death, Buck, having lost his purpose in life, decides to join the herd and live on the surface. Upon hearing a distant familiar roar that tells him that Rudy survived the fall, he chooses to stay and causes a cave-in that seals off the path between the surface and the underground jungle, trapping him inside and everyone else on the surface. He and Rudy proceed to continue their battle.
Buck and Rudy make brief cameos in "Scrat's Continental Crack-Up" and " when Scrat falls through the Earth and passes them.
He returns to help the herd with an ancient stone pillar and rejoins them to stop the asteroid in " while being pursued by a family of Dino-Birds.
Due to being voiced by Simon Pegg, Buck speaks with a British accent.