Unclear statements 

The article is peppered with statements such as "Rodents make up ... over 40 percent of mammalian species", "There are around 20 extant species", "Bat species account for about 20% of all mammals", "The carnivores include over 260 species" etc. etc., where it is unclear, in this context, whether the statistics apply to mammals found in the US or mammals generally. I flagged a couple inline, but really someone needs to go through the whole article clarifying these. 81.152.168.164  .