Nope, changed my mind!

Simon got half way under the cage door then decided to awkwardly go in reverse rather than just keep crawling forward.  He is not good at hopping backwards.

What?!
Simon does not understand why his solution to the problem is a source of amusement.
You may be wondering why there's a fly swatter on top of the cage.  That, my friends, is our patented spider-killing device.  River won't leave her cage if she spots one (perfectly understandable) and acts as my advanced warning system when her "spidey-senses are tingling".  Spring is hard on arachnophobes.