Good point, and I think I can answer that, Ray, because I have several melons he wasn't able to get through the rind on. They have big fingernail gashes all over them as well as big bite marks. So it seems that they just claw and claw and bite at it until they get through, then they clean it out. One thing that makes me doubt coons/opossums is the sheer volume of watermelon meat they eat in one night. Its way more than a small animal could consume. THen again, it could be several of them I guess. Also, if you google coyote eating watermelons there are quite a few photos of it happening. Here is one:
Again, NOT my photo, but certainly supports the idea that they eat them and again, 2 years ago I saw one in my patch eating a melon. All that being said, I'm STILL not 100% certain they are the culprit.
OH....and here we don't havve any "lizard man" so it can't be that. Of course, we do have a lot of Chupacabra and big foot running around....so it could be them! hahaha