Peregrine Falcons

Error message

  • Warning: Declaration of openlayers_layer_type_osm::options_form() should be compatible with openlayers_layer_type::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_layer_type_yahoo::options_form() should be compatible with openlayers_layer_type::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_layer_type_virtualearth::options_form() should be compatible with openlayers_layer_type::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_layer_type_tms::options_form() should be compatible with openlayers_layer_type::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_layer_type_raw::options_form() should be compatible with openlayers_layer_type::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_layer_type_cloudmade::options_form() should be compatible with openlayers_layer_type::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_layer_type_geojson::options_form() should be compatible with openlayers_layer_type::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_layer_type_xyz::options_form() should be compatible with openlayers_layer_type::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_layer_type_google::options_form() should be compatible with openlayers_layer_type::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_layer_type_kml::options_form() should be compatible with openlayers_layer_type::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_layer_type_maptiler::options_form() should be compatible with openlayers_layer_type::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_layer_type_wms::options_form() should be compatible with openlayers_layer_type::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_layer_type_openlayers_views_vector::options_form() should be compatible with openlayers_layer_type::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_behavior_scaleline::options_form($defaults) should be compatible with openlayers_behavior::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_behavior_fullscreen::options_form($defaults) should be compatible with openlayers_behavior::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_behavior_dragpan::options_form($defaults) should be compatible with openlayers_behavior::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_behavior_attribution::options_form($defaults) should be compatible with openlayers_behavior::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_behavior_popup::options_form($defaults) should be compatible with openlayers_behavior::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_behavior_mouseposition::options_form($defaults) should be compatible with openlayers_behavior::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_behavior_panzoombar::options_form($defaults) should be compatible with openlayers_behavior::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_behavior_zoomtolayer::options_form($defaults) should be compatible with openlayers_behavior::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_behavior_geolocate::options_form($defaults) should be compatible with openlayers_behavior::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_behavior_permalink::options_form($defaults) should be compatible with openlayers_behavior::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_behavior_zoombox::options_form($defaults) should be compatible with openlayers_behavior::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_behavior_navigation::options_form($defaults) should be compatible with openlayers_behavior::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_behavior_drawfeatures::options_form($defaults) should be compatible with openlayers_behavior::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_behavior_panzoom::options_form($defaults) should be compatible with openlayers_behavior::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_behavior_tooltip::options_form($defaults) should be compatible with openlayers_behavior::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_behavior_layerswitcher::options_form($defaults) should be compatible with openlayers_behavior::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_behavior_cluster::options_form($defaults) should be compatible with openlayers_behavior::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Warning: Declaration of openlayers_behavior_boxselect::options_form($defaults) should be compatible with openlayers_behavior::options_form($defaults = Array) in include_once() (line 480 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/ctools/includes/plugins.inc).
  • Notice: Only variables should be passed by reference in field_landing_page_for_term() (line 60 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/field_museum_util/field_museum_util.module).
  • Notice: Undefined index: und in custom_menu_field_block() (line 42 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/custom_menu_field_block/custom_menu_field_block.module).
  • Warning: array_reverse() expects parameter 1 to be array, null given in custom_menu_field_block() (line 42 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/custom_menu_field_block/custom_menu_field_block.module).
  • Warning: Invalid argument supplied for foreach() in custom_menu_field_block() (line 64 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/custom_menu_field_block/custom_menu_field_block.module).
  • Warning: Invalid argument supplied for foreach() in custom_menu_field_block() (line 70 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/custom_menu_field_block/custom_menu_field_block.module).
  • Notice: Only variables should be passed by reference in custom_menu_field_block_block_view() (line 23 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/modules/custom_menu_field_block/custom_menu_field_block.module).
  • Notice: Trying to access array offset on value of type bool in expeditions_page_alter() (line 198 of /var/www/science-and-education/Expeditions-website/drupal/sites/all/themes/expeditions/template.php).
Illinois, USA
Monitoring Endangered Peregrine Falcons in Chicago

Step out on a ledge with Field Museum scientist Mary Hennen as she climbs some of Chicago’s tallest skyscrapers to monitor our recovering population of once-endangered Peregrine Falcons. Over the last 20 years, Mary and her fellow team members on the Chicago Peregrine Program have helped to successfully reintroduce these beautiful birds back into the Midwest.

Check out Mary's Expedition Archive, where you can browse through photos, dispatches, and interactive maps describing the birds' mating, nesting, and breeding progress over the years. Each spring, you can also tune in to our webcams at various nesting sites to watch offspring hatch, mature, and fledge (take their first flight).

Newest Updates

Explore Mary Hennen's previous expedition seasons to learn more about Peregrine Falcons and The Field Museum's Chicago Peregrine Program. Be sure to...