Clare, a peregrine falcon that was hatchling on the 53rd floor ledge of The Clare at Water Tower, a retirement living community, is tagged by bird expert Mary Hennen of The Field Museum, Monday, June 11, 2012. | John H. White~Sun-Times

Clare, a peregrine falcon that was hatchling on the 53rd floor ledge of The Clare at Water Tower, a retirement living community, is tagged by bird expert Mary Hennen of The Field Museum, Monday, June 11, 2012. | John H. White~Sun-Times

Clare, a peregrine falcon that was hatchling on the 53rd floor ledge of The Clare at Water Tower, a retirement living community, is tagged by bird expert Mary Hennen of The Field Museum, Monday, June 11, 2012. | John H. White~Sun-Times

Clare, a peregrine falcon that was hatchling on the 53rd floor ledge of The Clare at Water Tower, a retirement living community, is tagged by bird expert Mary Hennen of The Field Museum, Monday, June 11, 2012. | John H. White~Sun-Times

Clare, a peregrine falcon that was hatchling on the 53rd floor ledge of The Clare at Water Tower, a retirement living community, is tagged by bird expert Mary Hennen of The Field Museum, Monday, June 11, 2012. | John H. White~Sun-Times

Clare, a peregrine falcon that was hatchling on the 53rd floor ledge of The Clare at Water Tower, a retirement living community, is tagged by bird expert Mary Hennen of The Field Museum, Monday, June 11, 2012. | John H. White~Sun-Times

The parents of Clare, a peregrine falcon that was hatchling on the 53rd floor ledge of The Clare at Water Tower, a retirement living community, flying pass window as Clare is tagged by bird expert Mary Hennen of The Field Museum, Monday, June 11, 2012. | John H. White~Sun-Times