- IORC Number
- 2015-005
- Species/Form in Question
- Slaty-backed Gull
- Scientific Name
- Larus schistisagus
- Current Status of Record:
- Accepted
- Date of Initial Sighting:
- 2015-02-07
- Date of Last Sighting:
- 2015-02-07
- Quantity:
- 1
- Age/Gender:
- Adult
- Observers(s)
- Geoffrey A. Williamson
- Location
- Calumet Park, Chicago
- Counties Observed in:
- Cook
- References
- 21st IORC Report
- Details