I had this tray of beetroot seedlings in the greenhouse.
It took me a while to understand what might have been going on with the plants on the left hand side. A couple of days ago I opened the door to find a bird in the greenhouse, presumably having flown in through one of the roof vents. Next to the module tray was a small pile of compost, so I’m guessing that the bird (it disappeared too fast for me to identify it) had been digging in the compost for some reason. Perhaps it likes beetroot?