I’ve removed the graph functionality from the species list. I vaguely remember stating at the time that I implemented it that it was kind of pointless and more of a learning experience for me than anything else. The site statistics back this up, with barely anyone looking at the graph page. For that functionality to exist, certain code needed to be loaded into memory which was having a disproportionately adverse effect on server performance when compared to the number of visits that page had. If I decide to reinstate similar functionality in the future I will do it in a more streamlined way, and only if the resulting graphs are actually of any value to the site.