von baumarkthammer » 8. Jul 2010 23:23
No I don´t think so, sometimes ants do so because one worker thinks that might be usefull, than a worker that workes inside the nest finds it and it smells like a different species what causes them to throw it away. Often Formica fusca do so in Polyergus nests when the Polyergus workers carry in an egg of Formica rufa or other ants, they carry it out and in, out and in and endlessly so on.
Probably your ants will eat them after all maybe they carry out sand or something like that?
You know which species you tried to feed them?