In Malaysia, fire ants build nests in leaves by folding the leaf downwards over itself, with the queen inside, and then excreting a sticky white substance with which they seal the fold and make a protective cover for the eggs.
<a href="//commons.wikimedia.org/w/index.php?title=User:Tyabji&amp;action=edit&amp;redlink=1" class="new" title="User:Tyabji (page does not exist)">Tyabji</a>
CC BY 2.5
<span class="int-own-work" lang="en">Own work</span>