Perhaps biotope? From what I understand, it depends on how specific you want to go. For example, a South-American biotope would include plants and animals only native to South America. You can get more specific, such as a Brazilian or Venezuelan biotope, or get even deeper into it, and do a biotope specific to a river or tributary. This can be done for just about any habitat. It does not necessarily have to be a single species, but species found in whatever particular area you're trying to represent. I'm currently working on a South American biotope, modeled after something like an Orinoco River habitat, so for me, it's a sand base, leaf litter, and wood...no rocks, and sparse, if any, plants. Water will be soft, and acidic. I'm not being as particular about the livestock, and going with a more general "South American" theme. If you search "biotope" even on youtube, you'll come up with examples.