I have/had two beautiful Giant elephant ears and some lovely Swiss Chard about 18 inch leaves in pots on my deck. Well they were beautiful and big until 2 nights ago. Something ate them all down to the stems, half one night, the rest the next. I dont' see any signs of slugs/pests even when I checked periodically during the night. Whatever ate theem didn't touch any of my other plants or vegetables.

Any ideas what it might be or how to stop them ?