The word "taxon" refers to a group or category in the classification of living organisms. It helps scientists organize and categorize different species based on their similarities and evolutionary relationships. Full definition
If you use a Collection of taxon pages, then the tool does work. (eol.org)
brachyptera Klarert... more taxon associations (eol.org)
Owing to this morphological similarity, westslope cutthroat trout populations with less than 20 per cent non-native admixture have been included as part of the native taxon in a recent status review (Department of the Interior (DOI) 2003). (rsbl.royalsocietypublishing.org)