Dr. Solomon David, a fish ecologist at the Shedd Aquarium in Chicago, is a huge movie buff, looking forward to "Avengers: Age of Ultron," "Star Wars" and all of the other big blockbusters coming out this year. As it turns out, however, he's made quite a small blockbuster of his own recently: "Leech-nado," a one minute and 50 second clip featuring a squirm-inducing school of leeches swimming and wiggling through a Green Bay waterway.