Because Rober’s squirrel-proof bird feeder is also a squirrel obstacle course and squirrels, apparently, are little furry ninjas.

Like many who have tried to tackle a squirrel situation, he first tried a bird feeder with a wire cage —only to discovery that he, as Mark puts it, "completely underestimated his adversary." ...

[Mark Rober] has a bird feeder in his back yard. Also, squirrels who eat the seed. So, as one does, he built a nine part squirrel obstacle course with a reward of walnuts at the end, and filmed ...

Anyone with a bird-feeder knows that squirrels love to steal treats that aren't meant for them. This moved one former NASA and Apple engineer to come up with a clever way to combat these menaces ...

And for those that make it all the way from the early bird feeder trials, to the explanation of the obstacle course, to the eventual squirrel “contestants” that show off their skills to bust ...

Humans have exploited the squirrels’ determination for their own amusement-just Google “squirrel obstacle course”, and prepare to laugh until you hyperventilate.

Can anything keep squirrels off a Menlo Park bird feeder? Squirrels are highly motivated to get to food, and they learn quickly by trial and error ...

The record for most trips through the obstacle course: 20 times in one day by a single squirrel. Obstacle courses for squirrels apparently are quite popular with backyard enthusiasts.