Quote Originally Posted by Annarose15 View Post
My bee (and a few others) look like that when they are trying to push the "lid" off, even though my tubs are in a lidless rack. The shaking is actually them exerting themselves to push. I only see it during feeding time or when they are very active at night.
This, this is definitely along the lines of what I was trying to explain. Mine do this as well, and the shaking/wobbling is just from them trying hard to move the "lid".

Sounds like yours were just trying to get out, and exerting themselves to do so.

-Jen