Keeping greens warm at night & protected from rabbits

I'm not sure what critter--possibly a rabbit or chipmunk--is eating the tops of the radish plants, but I am protecting them with a recycled cage. Other recycled materials I am using are glass panes to protect the greens from rabbits but also to protect them from cold nights. 

 I have only been protecting the container of greens. The other greens growing in the main gardens, as I have said before, are not growing due to rabbits digging up the seeds, and also squirrels burying their nuts in the garden. But if any greens begin to sprout in the main gardens, I will be using transparent plastic to cover the garden (to keep them warm at night), or a garden cloth.