Just for the fun of it...and because I literally and obsessively compile lists...I've been putting together a list of the greatest zoos in the United States and Canada. I've compiled this list by using various measures to rank each zoo. Scoring points, for example, if the zoo is AZA/CAZA accredited, the number of photos posted on ZooChat, zoo rankings published on travel websites and by individual ZooChatters (including myself for the 50+ I have visited), to whether or not the zoo exhibits North American Black Bears. I would compare this activity to a Fantasy Sports League...neutral (mostly) statistical analysis. "Greatest" is not meant to convey largest, most popular, my personal favorites, or best...except in a strictly Alexandrian way. Phase I is complete. I've also pulled the Canadian Zoos from the list, as I believe the metrics analyzed in Phase I were greatly to their benefit. Phase II (scoring native species displayed, number of birds species displayed, natural predator/prey balance....etc....) will see the Canadians wrapped back in to the total scores. As it stands Calgary has scored the highest of the Canadian Zoos, currently ranked as the 7th Greatest Zoo in the United States and Canada. Now, again, just for fun and for the benefit of other list keepers out there...here is my ranking of the 150 Greatest Zoos in the United States...so far.