The ants that you'll receive when you send off the voucher that comes with your ant farm will almost certainly be harvester ants. The name suggests that they might be vegetarians but that's not necessarily the case. They will consume pretty much anything that contains protein and carbohydrate. They will eat plant seeds in abundance however, most of these are likely to come from grasses. Some grass species will actually grow on the soil that has been excavated from the tunnels by the ants, so the ants don't have to go exploring to find their food. Harvester ants will also eat the seeds, pollen and nectar from many other plant species.
Carnivores
A large number of carnivorous behaviors is has been seen in harvester ants. These include the queen feeding unhatched eggs to her first brood of offspring and, in the case of the Florida harvester, she feeds special sterile eggs, which have been laid by the workers, to juvenile ants. These sterile eggs are called trophic eggs and this behavior has only been seen in the Florida harvester.
I am unaware of any cases of cannibalism in harvester ants so the occupants of your ant farm should be quite safe from each other... What else do harvester ants eat? Well, termites, many castes of which are soft-bodied and quite defenseless, comprise roughly sixty percent of their meat intake. Bigger insects, such as grasshoppers and crickets form the remainder* (see below), usually the ants will extract the soft tissue from the inside of the insect's exoskeleton if it is too big to be removed to the nest.
Foraging for food
By far the most common foraging strategy is called individual foraging. Using this strategy, individual workers will leave the nest to hunt on their own. This is believed to be the most basic of the hunting strategies and, because it is the least sophisticated, it is the strategy that is likely to result in the highest rate of failure and loss. An individual ant is much more likely to be eaten by another animal than is an organized group.
Ants foraging as a group is undoubtedly one of the most interesting phenomena in the insect world. Many ant species, such as the Florida, western and red harvester ants all display this behavior and this is one of the reasons for their success. Occasionally, columns of ants over a hundred feet in length and two inches wide can be seen and any small animals that stand in their way are almost certainly doomed if they do not escape in time. When a group attack takes place the insect (it's usually an insect) is cut up and taken back to the nest. Often different ants will assume different roles when dealing with prey, from attacking, to dismembering and even digging underneath large prey to make it easier to move. Although the armies of harvester ants on the move are a fearsome sight to many animals, it should be remembered that not all foraging trips are successful. They only come back with food about sixty percent of the time. So the ants in your ant farm ought to be eternally grateful that you are providing them with food without their having to move from their doorstep.
* The header picture at Ant Farm Central shows a green cricket being dismembered by ants.
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