Lake Michigan is the only Great Lake entirely in the USA.

Nepal is the only country in the world which does not have a rectangular flag - it has two triangular pennants, one on top of the other.

The letter "Q" is the only letter not used in the spelling of any of the 50 US states.

The great horned owl is the only animal that will eat a skunk.

The kiwi is the only bird that has nostrils at the end of its bill.