Owner Mei Shan Li told how he greets his pet with a wave and a ‘Hello’ every morning.
But this time, Alduin decided to wave back.
Thankfully, Mei captured the adorable moment on film and uploaded it to the internet.
In an hour, the clip received more than 612,000 views and 120,000 reactions.
Facebook user William Tomlinson commented: “This is so cool that it’s almost borderline creepy.”
Brian Mcguinness wrote: “I have five bearded dragons and they wave their arms when in submission to a bigger dragon. Also head bobbing is a natural trait for them.”