The site uses CSS to show information about 30 species that are endangered. Here is one example:
It provides additional information about all the species in a graph type I personally don’t think shows the data very clearly, but it does use a nice way to show the years by default that change to values when the user hovers over the graph: >
For those who want to know more on how it’s done: there’s a link at the bottom of the individual species pages.
Also note the species can be downloaded individually as wall papers.