Protecting the garden

The garden needs to be protected from chickens that scratch and mice that dig holes through it....

Keeping the chickens out seems like an easier task so I purchased 100 feet of deer fencing.

It's five feet tall so the birds can fly over it, but right after I put it up a bird came around and then couldn't figure out how to get out of the garden.  

I will need another two rolls to finish containing the garden and I will need to build a door at the entrance, but I think this will help to keep the birds out of the garden.

Next task: how to kill all of the mice that dig through my garden?