Is it possible that it's a cat? Or a rabbit or some other type of fluffy critter? I realize that sounds silly, because I'm sure you would have noticed if there were animals near your plants. But my cats like to sample my herbs every now and then and this is similar to the bites that they make so I just thought I'd throw that out there.

Not much damage right now, I wouldn't worry. Yes, it could be from domestic animals. Right now, I see gypsy moth caterpillers here and will have to start putting out some traps soon. The oak trees around here seem to get major infestations about every 5-7 years. Every single one I see I sqush. I just hope that my garden vegetable plants don't become infested. If so, the Bt would help some, but I would probably try Neem first, if it has control over them. I will wait and see

Something is eating mine, too. Just the Sweet Basil. None of my other herbs are even being touched. What's up with that?!? I sincerely doubt it's the cats, they don't go into the herb garden much, but I haven't seen any bugs, either. I don't want to put anything on it, so I'm going to unpot some marigolds out of one of my planters and plant around the basil to see if that helps any.