Ants hives are defined by individuals herding together.
Its interesting to think how humans, with our flexible ability to create social groups and rely on memes (via word of mouth, written word, stories, and now the internet), end up sharing information in the environment a way similar to how ants 'share' information by putting scents in the environment. Its almost like our brains are acting as a sort of virtual-landscape of scents, allowing us to act remotely without needing to be in close proximity to environmental sources of knowledge.
Researching how different social structures - how various forms of flat vs hierarchical management orientations ( http://haas.berkeley.edu/faculty/papers/anderson/functions%20and%20dysfunctions%20of%20hierarchy.pdf
) - can increase the effectiveness of an organization, it raises the question in my mind: is intelligence an emergent property of information networks? I mean, aren't our brains just a coagulation of cells who use networks to work together?
Most people assume an ant colony is ran by a queen because of our indo-european cultural heritage stemming out of feudalism and our modern management practices stemming out of troubles in information flow. This is simply not the case! Each ant is simply working on it's own built in behavior and as a reaction to it's environment and memory.
What most people don't realize that ants span the entire gamut of crowd types. Some ants are basically loners, some form small groups of queens who simply share a resource (food storage, shelter). Some go complete hive-mind, but don't associate outside of their small groups, and some create massive multi-colony conglomerates that span the world.
There's a great documentary covering the various types of ant colony formulations: https://www.youtube.com/watch?v=55tXhnlZoOg
Here's a clip from a kind of the trap-jaw ant (Odontomachus brunneus) who's reproductivity isn't limited by genetics (all females can reproduce, no sterility), but instead they use a form of 'social shaming' to discourage a particular nesting behavior: https://www.youtube.com/watch?v=SW9D6ea4d5A
It is no wonder that the origin of sociobiology came out research in ants, monkeys, and systems invovled with the biosphere: https://www.youtube.com/watch?v=wKbj3ZDmvdU
TL;DR: I wonder if ants get depressed.