Birding spot · Cook County, Illinois
Birding at Gillson Park: What You'll See Each Week In November, the birds most often reported at Gillson Park are Ring-billed Gull (81%), Mallard (77%), and Red-breasted Merganser (71%). It is busiest in spring, when 85 species turn up on at least 1 in 20 checklists, and species counts peak in the second week of May (94 species). 215 species have been reported here across 2,832 complete checklists from 480 birders.
Species by week 0 20 40 60 80 100 Jan 1-7: 23 species on 5%+ of 89 checklists Jan 8-14: 24 species on 5%+ of 61 checklists Jan 15-21: 31 species on 5%+ of 56 checklists Jan 22-31: 25 species on 5%+ of 50 checklists Feb 1-7: 28 species on 5%+ of 39 checklists Feb 8-14: 28 species on 5%+ of 34 checklists Feb 15-21: 28 species on 5%+ of 46 checklists Feb 22-28: 28 species on 5%+ of 58 checklists Mar 1-7: 34 species on 5%+ of 49 checklists Mar 8-14: 33 species on 5%+ of 99 checklists Mar 15-21: 36 species on 5%+ of 57 checklists Mar 22-31: 61 species on 5%+ of 71 checklists Apr 1-7: 57 species on 5%+ of 68 checklists Apr 8-14: 56 species on 5%+ of 67 checklists Apr 15-21: 56 species on 5%+ of 52 checklists Apr 22-30: 71 species on 5%+ of 112 checklists May 1-7: 84 species on 5%+ of 138 checklists May 8-14: 94 species on 5%+ of 148 checklists May 15-21: 91 species on 5%+ of 127 checklists May 22-31: 76 species on 5%+ of 113 checklists Jun 1-7: 69 species on 5%+ of 19 checklists Jun 8-14: 41 species on 5%+ of 23 checklists Jun 15-21: 54 species on 5%+ of 17 checklists Jun 22-30: 50 species on 5%+ of 11 checklists Jul 1-7: low data (9 checklists) Jul 8-14: low data (8 checklists) Jul 15-21: low data (7 checklists) Jul 22-31: 56 species on 5%+ of 13 checklists Aug 1-7: 45 species on 5%+ of 16 checklists Aug 8-14: 49 species on 5%+ of 16 checklists Aug 15-21: 54 species on 5%+ of 31 checklists Aug 22-31: 46 species on 5%+ of 27 checklists Sep 1-7: 59 species on 5%+ of 44 checklists Sep 8-14: 65 species on 5%+ of 80 checklists Sep 15-21: 64 species on 5%+ of 48 checklists Sep 22-30: 71 species on 5%+ of 78 checklists Oct 1-7: 57 species on 5%+ of 45 checklists Oct 8-14: 68 species on 5%+ of 60 checklists Oct 15-21: 50 species on 5%+ of 43 checklists Oct 22-31: 55 species on 5%+ of 92 checklists Nov 1-7: 66 species on 5%+ of 76 checklists Nov 8-14: 50 species on 5%+ of 94 checklists Nov 15-21: 35 species on 5%+ of 62 checklists Nov 22-30: 38 species on 5%+ of 92 checklists Dec 1-7: 33 species on 5%+ of 45 checklists Dec 8-14: 33 species on 5%+ of 57 checklists Dec 15-21: 29 species on 5%+ of 48 checklists Dec 22-31: 28 species on 5%+ of 137 checklists Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Number of species reported on at least 5% of complete checklists, by week (4 per month). Grey bars: fewer than 10 checklists, not counted. In November: what to expect 1 Ring-billed Gull 81% 2 Mallard 77% 3 Red-breasted Merganser 71% 4 American Herring Gull 61% 5 Dark-eyed Junco 57% 6 American Crow 45% 7 Canada Goose 44% 8 Hooded Merganser 40% 9 American Robin 40% 10 Common Goldeneye 38% 11 European Starling 30% 12 House Sparrow 28% 13 Downy Woodpecker 27% 14 Common Loon 23% 15 Redhead 23% Share of complete checklists at this spot that reported the bird in November. The sparkline is the whole year, with this month highlighted.
Season by season Specialties Birds reported far more often here than across Illinois.
Nearby spots Frequency is the share of complete checklists at this location that listed the bird, 2016–2025. Busy places report more of everything, and the weekly chart counts species on at least 5% of checklists so a few stray reports do not inflate it. How to read it .
Ring-billed Gull81%
Mallard77%
Red-breasted Merganser71%
American Herring Gull61%
Dark-eyed Junco57%
American Crow45%
Canada Goose44%
Hooded Merganser40%
American Robin40%
Common Goldeneye38%
European Starling30%
House Sparrow28%
Downy Woodpecker27%
Common Loon23%
Redhead23%