(very belated response, but time is behaving oddly for me right now)

Yes, the rat's little hands! OMG.

I love that about compost too. Mostly I have gotten vast, sprawling cherry tomato plants with very nice sweet tomatoes on them, but once or twice I got volunteer phlox, white-eyed pink sports of Phlox David as far as I can tell (Phlox David has white flowers) and a couple of times an amazing net of black nightshade.

P.