Engineer creates crazy squirrel Olympics obstacle course in his backyard

Mark Rober is an engineer and hugely popular YouTuber who covers science, technology… and backyard squirrel sports, apparently. Mark has made a number of videos where he builds various obstacles and challenges for the squirrels in his backyard.

In this video, he puts all of this together into a grand challenge. Behold the Backyard Squirrelympics 3.0! Who will win the Walnut Cup?