Tail whip?

[Jeremyxb12]

Hey goes have a question My tegu phoenix is seemingly happy being out of the cage right now he is walking around coming up to me licking me no problems whatsoever but all of a sudden he starts waking away and tail just starts to randomly whip. this has peaked my curiousity and prompted me to post here. any ideas?

 

[Roadkill]

Depends on what you are calling "whip".