Colin Purrington<p>Oak twig with a labyrinth-like feeding tunnel made by a bark-mining caterpillar, likely Zimmermannia bosquella (Nepticulidae). I look for these whenever I'm near an oak and bored, but have only seen these on a single tree in Media, PA, USA. <a href="https://flipping.rocks/tags/lepidoptera" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>lepidoptera</span></a> <a href="https://flipping.rocks/tags/moth" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>moth</span></a> <a href="https://flipping.rocks/tags/caterpillar" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>caterpillar</span></a> <a href="https://flipping.rocks/tags/insects" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>insects</span></a> <a href="https://flipping.rocks/tags/oaks" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>oaks</span></a> <a href="https://flipping.rocks/tags/quercus" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>quercus</span></a> <a href="https://flipping.rocks/tags/entomology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>entomology</span></a> <a href="https://flipping.rocks/tags/pennsylvania" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>pennsylvania</span></a></p>