My guess is that it's a rat. I have a pomegranate tree out front, one day, I went outside, and something ate part of a big, beautiful, ripe pomegranate. Next day, another one. Next day, another, and this went on nightly for a couple of weeks. Once the creature had eaten a good chunk out of each one, it started on my vegetable garden. One by one, the plants were decimated. Ate all the tomatoes, squash, peppers, etc. I'd thought it was a deer at first, because the pomegranates were kind of high up. Nope, it turned out to be a roof rat. Tooth marks on the tomatoes was the giveaway.