The cow's correlation to server players are the core basis of any good server. The builders

They usually don't get out of line, and if they do, its usually the young ones. They provide a good backbone, and will usually provide some good stuff to the server

Pigs are the griefers. 4 pigs without restraint can do a ton of damage in one afternoon to a lawn or a pasture. They root by nature, and rooting is destructive. I just spent all afternoon cleaning up after a few of them getting out into my grandparents yard.

You see how they correlate right? if not, here:
Pigs are destructive, as are griefers, but both can sometimes produce good things (like bacon)

Sheep are the inventive and decorative builders. Sheep are usually docile (if tamed) and are quite beneficial for clothing purposes. People don't need wool clothes, just like people don't need fancy builds, but we want them, so yeh.

They are the fanciest animal on a farm, and usually are the fanciest people on a server

The chicken are the people that will build, and do pretty much nothing else. They don't interact much, they don't do much besides build. But they can get territorial and agitated.

Cats (and the players that correlate with them) do not much else but talk. They don't build much, they don't do much, they just talk. They are usually new players to the server, without much else to do but ask people for stuff.

The dogs are mods, they keep order, and do aid the admin (to come) in keeping people in check

De farmer be admin - duh

Usually very artistic, a lot like sheep, but very refined, always cool, always make good builds, never get out of hand

And Home Reeled it too: