> IUCN has recently revised the species at risk categories. They can be > through the IUCN home page. ... > ... So its not necessary to re-invent what is meant by rare. ... I see something at: http://www.iucn.org/themes/ssc/redlist/categor.htm Is that the page? It appears to be about endangeredness rather than rarity as such. -- Geoff Read <g.read at niwa.cri.nz>