On a walk in the rain, we found this silk-wrapped package of Christmas fern frond leaflets. What created this fern ball? And what benefit does it provide?
Answer
This is the work of a larva (caterpillar) of one of several moth species in the Herpetogramma genus. Fern balls provide sheltered platforms where the larvae can feed on fern tips while staying out of sight of predators.
This week’s contest winner was Jim Shaw