Looks like rat to me. Watermelon seeds are too small of an incentive for squirrels. Get a cat or two! They are much better than dogs at deterring rodents because they are proactive. I have 3 of them and they spend 90% of their time napping in my garden: squirrels stay at bay, possums also ( except for one that they tolerate on the fence only - not on the ground-) birds do not pick my fruits or vegetables, no rats, no mice = peace of mind. With nectarines, apricots, grapes, plum, pears, tomatoes, cantaloupes, watermelon etc, in my garden, there would be rodents all over the place if it wasn't for them! If you do not want a cat as a pet, associations are giving "barn cats" they are neutered microchipped and vaccinated, they live in barns/sheds and they do their hunter job. But you need to provide a safe place where they can go when it is too cold or too hot, water, food, vaccines, and vet care. Mine are well fed and are spoiled pets so they don't "over hunt" and sleep on our beds. They run after pests but stop the chase as soon as the critters are out of the garden. Good balance. Squirrels are staying high in the trees ( I like squirrels as long as they don't eat my fruits) I keep a stepladder in between my tomato plants, the cat lays on the upper stair and the birds do not even think about my tomatoes: problem solved.

It looks very similar to Solanum pseudocapsicum, Jerusalem or winter cherry. This is a rather tender perennial, frequently sold as a houseplant in colder climates, that is often seeded by birds in more southerly areas. All parts of the plant are poisonous, so I'd hesitate to make taste tests to see just how much like watermelon it is - small amounts ingested will cause just gastrointestinal upset. You would have to eat quite a bit to have truly toxic effects. Here is a link that might be useful:

It is an epiphyllum. There are many different varieties and they are widely discussed in the Cacti & Succulents Forum. Note that they are often called an "epi" for short. Carol Here is a link that might be useful:

Hi guys, bought this plant a couple of months back. It's grown well, tripling in size and height, however now it has a black speckled pattern across the leaves, as well as some transparent blotches. Any ideas what the issue is?