The only way to know what is snacking on your plants is to observe the offender with your own eyes - a camera with a motion-detection feature would be the idea way. Other than that, everything else is an unfounded guess on our part (and likely not helpful to you).
Here in the Detroit area, squirrels, birds, and rabbits never touch my tomato plants (I know my personal experiences are unique only to me, not others). But deer here will eat a tomato plant down to the ground with no trace left in mere minutes. Animals, like humans, are opportunists and will take what they can get. Something surely likes what you have on offer.
Whatever it is, I hope you find a competent mitigation strategy in the near-term so that you can enjoy a 'fruitful' harvest! Good luck!
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