When I went to water my garden yesterday morning, I found that all 4 of my bell pepper plants had been eaten down to the main stem (a shame, they were growing so nicely). Then this evening, I was outside and noticed that all the leaves of one tomato plant have been eaten off; also several leaves on another tomato plant are missing.

There isn't any sign of tracks or prints in the dirt, nor have I seen any indication of insects anywhere.

Can anyone help me?

Thanks in advance.