2 Messor Barbarus workers eye up a seed.

My harvester ants stockpiling seeds for the winter (although they do this all year round). The major workers crack the hard outer seed casings and smaller workers chew the seeds up and make what's known as 'ant bread' with it to feed the colony. There's quite a diverse range of size between the workers - many people assume the larger ants are soldiers but this species does not have a soldier caste.