Hello!
One of many seeds got bad in my Messor sp. (maybe wasmanni) formicarium and they just stacked dirt and other particles around it on a stone, also, looks like they moisten it too.
Quite interesting for me as I have never seen something like this before, but that looks like a natural reaction.
Rattus
Edited by Rattus, January 31 2017 - 2:26 PM.