Reader Dan Zucker shared this photo of intricate patterns “in the rust-colored artist’s bracket (fungus) spores on a large fallen birch trunk.” What made these marks?
Answer
This is an elaborate example of a snail feeding track. The patterns were made by the snail’s radula – a tongue-like organ comprising numerous tiny teeth – as they scraped particles off the surface of the wood.
This week’s contest winner was Matthew Charpentier