This week’s question is going to be a little trickier than some, so I am going to give out several hints at once.
Arizona, Connecticut, Florida, Idaho, Iowa, Maine, Maryland, Massachusetts, Missouri, Nebraska, New Hampshire, New York, North Carolina, Oregon, Rhode Island, South Carolina, South Dakota, and Vermont have none.
There were roughly 650 of these in 2006 in the entire world, on every continent but Antarctica. There are over 700 now.
There are roughly 150 in the United States. Over a third of these are in three states.
Canada has roughly 20, with one in most provinces.