We build a squirrel-proof bird feeder engineered to thwart a ground assault and make an aerial squirrel attack next to impossible. Will it work? Tap here ipm://votUiJ/votPl7 on your iPhone®, iPad™, or iPod touch® device that is equipped with the Autodesk Inventor Publisher Mobile Viewer app. Don't have the app yet? Download it FREE today! - http://www.engineering.com/content/emailblastredirects/adesk_sar/link01.htm Then click the Gallery button in the app and select Some Assembly Required by engineering.com Download the Birdhouse source file to create your own instructions in Autodesk Inventor Publisher - http://file2.engineering.com/engcom/publisher/Birdhouse.ipb Autodesk(r) Inventor(r) Publisher for your desktop - http://www.engineering.com/content/emailblastredirects/adesk_sar/link02.htm #Some_Assembly_Required #engineeringdotcom #Squirrel_Defense