Bluebottle, or  <a href="https://en.wikipedia.org/wiki/Portuguese_Man_O%27_War" class="extiw" title="en:Portuguese Man O' War">Portuguese Man O' War</a> washed ashore at <a href="https://en.wikipedia.org/wiki/wikipedia:Batemans_Bay,_New_South_Wales" class="extiw" title="en:wikipedia:Batemans Bay, New South Wales">Batemans Bay, New South Wales, Australia</a>.
<a href="//commons.wikimedia.org/wiki/User:Matilda" title="User:Matilda">AYArktos</a>
<span class="int-own-work" lang="en">Own work</span>