sentences: McKinnell is considered the authority on frogs in Minnesota, having specialized in herpetology for over 50 years.While initially the two thought that the deformities were an isolated occurrence that would disappear like an earlier outbreak at Granite Falls, the persistence of leg deformities into late summer and the discovery of other outbreaks, elsewhere around Henderson and elsewhere around the state, such as at Litchfield, quickly disabused of that notion.