Swan cygnets hatch at Lincoln Park Zoo in Chicago

Three trumpeter swan cygnets that hatched last week follow closely behind their mother at Lincoln Park Zoo on June 18, 2009. These youngsters are slated to be released into the wild this fall as part of the trumpeter swan re-introduction and recovery program. The Lincoln Park Zoo has released 34 swans into the wild, all of them the offspring of this same adult pair of swans. (UPI Photo/Greg Neise/Lincoln Park Zoo) .