I have a raised garden bed (2 ft tall) surrounded by a fence. My problem is that something has been eating the leaves off my sage plant. The stalk is still there and new leaves are coming back but I dont' want to lose those as well.

Then this morning when I went out check my garden I noticed that several of my tomato plants have missing leaves. The leaves are lying on top of the soil beside the plants.

Because of the fence and height of the beds I don't believe it is a deer or rabbit problem. I don't see any insects or soil disturbance around the plants and nothing else in the garden seems to be under attack. I have several other herbs in the same bed as the sage. I also have peppers, beans, onions and carrots in the beds.

Any ideas would be greatly appreciated. Would birds be doing this?