During a recent visit to my mother's garden- the horrible, destructive horn worm was discovered on her tomato plants. They are HUGE and they can destroy a whole plant over night! You can of course spray with toxic pesticides to get rid of them or take care of them the old fashion way- plucking them off the plant and cutting them in half with a pair of sissors. My kids and their cousins decided another option was to keep them as pets.
I get grossed out just LOOKING at them! I told you they were HUGE.