UPDATE: I’ve put Christopher’s response below in the comments; it’s #20.
Reader Christopher Moss sent this snow conundrum, and I’ll supply the answer in the comments at 11 a.m. Chicago time. Here’s the picture and the query, whose answer of course involves an animal.
My front deck with two inches of fluffy snow that fell yesterday. Ignoring the holes from drips off the roof that are seen at the bottom, do you see the chain-like raided elliptical blobs of snow, each with a longitudinal fracture down its centre? That’s the puzzle!