Ok, as promised here is a pose and some stills from an animation where the lion runs and then leaps:
http://mapage.noos.fr/samuelLK/AnimComp.jpg
And here is an animation of the mouse popping out of the box that scares the "brave" lion.
Other than the lid openning, it's all animated with expressions.
http://mapage.noos.fr/samuelLK/Bounce_01.avi (223 kb)