Any ideas?

[Mushusmum]

Any idea why mushu would be "standing" with his tail?

 

[TheraMygale]

Is it on enclosure wall? Maybe its just climbed there.

 

[Brewser]

Scorp Stretching

 

[darkness975]

Be glad it's normal. The last time I saw one of mine in a position like that she was dead.

 

[jennywallace]

Looks OK to me, maybe just exploring.

 

[Glorfindel]

failed attempt at climbing up the side glass

 

[Mushusmum]

Lol I never knew his tail was so strong

 

[Andrew Clayton]

Any idea why mushu would be "standing" with his tail?

They can't grip much to the glass surface, so they will use there tail to boost them up, basically trying to reach and see if there is any ledge or grip for it to climb. With nothing there though it's just slid to the side.