How do countries pick their National Symbol?

Why do countries have National Symbols? What are the most common National Symbols? What are the weirdest National Symbols?  Attention SmartyFamilies! Subscribe to WHO SMARTED?+ (Who Smarted? PLUS) and get 3 episodes of Who Smarted? every week, AD FREE, plus BONUS CONTENT! Apple users, sign up on the Apple App for a FREE TRIAL WEEK. Or, sign up HERE and get a MONTH FREE TRIAL (for monthly subscribers) or 4 MONTHS FREE if you subscribe for a year! Enjoy all the smarting, ad free with WHO SMARTED?+ Visit Whosmarted.com for official Merch, Back Episodes & Fun Activities.