Pulled from:
http://www.raphkoster.com/2006/06/04/uo ... em-part-2/
If the rabbit population suddenly drops (because some gung-ho adventurer was trying out his new mace) then wolves may have to find different food sources – say, deer. When the deer population drops as a result, the local dragon, unable to find the food he’s accustomed to, may head into a local village and attack. Since all of this happens automatically, it generates numerous adventure possibilities.
Pulled from:
http://www.raphkoster.com/2006/06/03/uo ... ce-system/
A rabbit, then, might look like:
* PRODUCE FUR in a small amount, and doesn’t regrow it; and MEAT
* EAT GRASS, FLOWER, and VEGETABLE, up to a small stomach size, in small nibbly bites.
* SHELTER in GRASS or BUSH, but treat BUSH as home if they’re a decent size
* DESIRE nothing, but have an aversion to anything that produces CARNIVOREMEAT
Conversely, a wolf might be
* PRODUCE FUR in a medium amount, and doesn’t regrow it; and CARNIVOREMEAT
* EAT MEAT, up to a small stomach size, in medium bites.
* SHELTER in TREE or CAVE, but treat CAVE as home if they’re a decent size
* DESIRE nothing, but have an aversion to anything that produces CARNIVOREMEAT
Stuff like pack behaviors were layered on top of this, so wolves, being pack animals, could have a DESIRE to be near other wolves. When animals were in a pack, they were supposed to add up their needs, so that a pack of wolves would start ignoring bunny rabbits and start being willing to tackle bigger game.
Lastly, the (in)famous dragon example:
* PRODUCE SCALES in a medium amount, and doesn’t regrow it; and a huge pile of CARNIVOREMEAT
* EAT MEAT or CARNIVOREMEAT, up to a huge stomach size, in big bites.
* SHELTER in MOUNTAIN or CAVE, but treat CAVE as home if they’re a decent size
* DESIRE GOLD, GEM, and MAGIC
He goes on to say it didn't end up working but it seems definitely possible and I'm curious if the resource system is going to be expanded to encompass something like this.
Lastly, un-factually, I 'swear' I remember animal-animal interaction in the early days of UO.