Ahh poor snuffelupuguses, or is it snuffelupugi? We really should take care of them better!
I just wanted to make sure we were on the same page. I still see worthiness of splitting it up a little more though I do agree that perhaps threatened/endangered split was a bit much. I wouldn't mind seeing in addition to your plants to also split off insects, although those might be less numerous (really depends there are more bugs than anything else but people notice them less and I don't think they make endangered list quite as easily).
I think naming the Category should be something to the effect of IUCN Red List Animals as that is the more internationalized list of endangered species. They also only seem to update their list once a year which might mean less fluctuation in the list (whereas I know our national and state lists fluctuate monthly almost which can be a pain). I think we have a good list here actually so I went and created a group tentaviely called
Animal Kingdom (don't think that is a good one but I can't think of one now) if anyone wants to help manage this.
The IUCN actually has a few categories of threatened (endangered being one of them). I think for this list category that it'd be good to include Extinct in the Wild, Critically Endangered, Endangered, and Vulnerable.
The Red List itself can be found
here. Wikipedia has done a good job of listing out all teh animals and splitting em up by categories
EW,
CE,
EN, and
VU. The website to the IUCN can be found
here.
It may also be a nice idea to at least suggest that waymarkers include links to information that is relevant to the animal species waymarked. Even if it is just a link to the actual wikipedia entry for that animal. I think it'd be nice for people browsing through the waymarks to find out more easily.