Wow, we were talking about that on one of the veggie threads recently.... don't remember which one, I'm on a lot of them, and I've noticed you are too.... If the tomatoes were red, it could be squirrels, birds, or coons, although coons tend to pick the whole tomato and take off with it. If they're green, it could be a little caterpillar related to army worms. I've had these for years, and I didn't even know what they were. I knew they were the enemy, cause they were eating my tomatoes. They also eat the leaves like hornworms. I've already found some this year on the leaves.