An interesting article on the possibly extinct locust of the American west.

http://www.nytimes.com/2002/04/23/science/23LOCU.html?ex=1020620080&ei=1&en=5b3cbd0dcb3f5662

Among other interesting facts there, this:

"In 1875 the species formed the largest recorded locust swarm in the history of humankind, 1,800 miles long and 110 miles wide, equaling the combined area of Connecticut, Delaware, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island and Vermont."

That is, I believe, the entire Northeastern United States. And then some.