What animal is the national symbol of Scotland?

There are a number of symbols that one can associate with Scotland - the thistle, the lion rampant and the St Andrews Cross Flag (or Saltire) to name a few. The main symbol is probably the Thistle as it has been an important Scottish Symbol for over 500 years. Legend says that a group of Scots were woken when a viking raider stood on a thistle prior to an attack, however, there is little evidence if any to support this.