Birding spot · San Mateo County, California
Birding at Inner Bair Island: What You'll See Each Week In November, the birds most often reported at Inner Bair Island are Snowy Egret (88%), Willet (78%), and Black-necked Stilt (76%). It is busiest in spring, when 74 species turn up on at least 1 in 20 checklists, and species counts peak in late March (83 species). 127 species have been reported here across 953 complete checklists from 456 birders.
Species by week 0 20 40 60 80 100 Jan 1-7: 82 species on 5%+ of 40 checklists Jan 8-14: 76 species on 5%+ of 49 checklists Jan 15-21: 72 species on 5%+ of 35 checklists Jan 22-31: 73 species on 5%+ of 54 checklists Feb 1-7: 75 species on 5%+ of 47 checklists Feb 8-14: 70 species on 5%+ of 42 checklists Feb 15-21: 63 species on 5%+ of 31 checklists Feb 22-28: 69 species on 5%+ of 32 checklists Mar 1-7: 79 species on 5%+ of 17 checklists Mar 8-14: 72 species on 5%+ of 11 checklists Mar 15-21: 71 species on 5%+ of 11 checklists Mar 22-31: 83 species on 5%+ of 15 checklists Apr 1-7: 71 species on 5%+ of 21 checklists Apr 8-14: 69 species on 5%+ of 15 checklists Apr 15-21: 73 species on 5%+ of 14 checklists Apr 22-30: 70 species on 5%+ of 20 checklists May 1-7: 57 species on 5%+ of 10 checklists May 8-14: 59 species on 5%+ of 13 checklists May 15-21: 45 species on 5%+ of 15 checklists May 22-31: 41 species on 5%+ of 10 checklists Jun 1-7: 47 species on 5%+ of 17 checklists Jun 8-14: 38 species on 5%+ of 10 checklists Jun 15-21: 45 species on 5%+ of 19 checklists Jun 22-30: 42 species on 5%+ of 15 checklists Jul 1-7: low data (6 checklists) Jul 8-14: 55 species on 5%+ of 17 checklists Jul 15-21: 52 species on 5%+ of 21 checklists Jul 22-31: 56 species on 5%+ of 15 checklists Aug 1-7: 58 species on 5%+ of 15 checklists Aug 8-14: 45 species on 5%+ of 13 checklists Aug 15-21: 56 species on 5%+ of 15 checklists Aug 22-31: 35 species on 5%+ of 11 checklists Sep 1-7: 51 species on 5%+ of 11 checklists Sep 8-14: low data (7 checklists) Sep 15-21: low data (9 checklists) Sep 22-30: low data (9 checklists) Oct 1-7: low data (2 checklists) Oct 8-14: 52 species on 5%+ of 13 checklists Oct 15-21: 65 species on 5%+ of 13 checklists Oct 22-31: 57 species on 5%+ of 31 checklists Nov 1-7: 66 species on 5%+ of 18 checklists Nov 8-14: 65 species on 5%+ of 14 checklists Nov 15-21: 63 species on 5%+ of 22 checklists Nov 22-30: 74 species on 5%+ of 20 checklists Dec 1-7: 62 species on 5%+ of 27 checklists Dec 8-14: 68 species on 5%+ of 12 checklists Dec 15-21: 82 species on 5%+ of 19 checklists Dec 22-31: 75 species on 5%+ of 50 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 Snowy Egret 88% 2 Willet 78% 3 Black-necked Stilt 76% 4 Double-crested Cormorant 76% 5 Greater Yellowlegs 73% 6 Great Egret 72% 7 Black Phoebe 70% 8 Bufflehead 69% 9 Song Sparrow 59% 10 American Crow 55% 11 Least Sandpiper 55% 12 Marbled Godwit 55% 13 White-crowned Sparrow 55% 14 Northern Shoveler 54% 15 American Avocet 51% 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 California.
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 .
Snowy Egret88%
Willet78%
Black-necked Stilt76%
Double-crested Cormorant76%
Greater Yellowlegs73%
Great Egret72%
Black Phoebe70%
Bufflehead69%
Song Sparrow59%
American Crow55%
Least Sandpiper55%
Marbled Godwit55%
White-crowned Sparrow55%
Northern Shoveler54%
American Avocet51%