is something wrong with my tegu (video)?

[Rhetoric]

One of the girls displayed a behavior I've never seen from a reptile. I'm really hoping it was a warning and not something serious...
I didn't keep tapping on the igloo to provoke her, it was so I could get a video to ask you guys for input..

http://www.youtube.com/watch?v=zJtkW5lwcLM

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See the video description for more info

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I feel dumb asking but I want to make sure.. :[

 

[Little Wise Owl]

Tail rattling? I believe that's a defensive behaviour.

I know snakes will rattle and wiggle their tails when their scared or agitated. My leopard gecko would slowly move his tail like what's seen later in the video when he was hunting or scared.

 

[Rhetoric]

I sure hope so! That was the first thing that came to mind, snakes. She's moving around fine now. I hope she was just unhappy

 

[Riplee]

It's normal. I saw a lot when they sleep, it's a defensive behavior

 

[teguboy77]

Its a defensive behavior like already said normal.

 

[Rhetoric]

Good a relief, I figured it was but I wanted to make sure, I had never seen my male do it and since the girls are new I'm still getting used to their behaviors and personalities. Thank you all for the answers.