Birding spot · Sussex County, Delaware
Birding at Mare Marsh: What You'll See Each Week In November, the birds most often reported at Mare Marsh are Great Black-backed Gull (80%), Boat-tailed Grackle (69%), and American Herring Gull (69%). It is busiest in spring, when 52 species turn up on at least 1 in 20 checklists, and species counts peak in the second week of May (61 species). 175 species have been reported here across 4,142 complete checklists from 1,269 birders.
Species by week 0 20 40 60 80 Jan 1-7: 35 species on 5%+ of 290 checklists Jan 8-14: 41 species on 5%+ of 237 checklists Jan 15-21: 38 species on 5%+ of 274 checklists Jan 22-31: 37 species on 5%+ of 348 checklists Feb 1-7: 37 species on 5%+ of 236 checklists Feb 8-14: 36 species on 5%+ of 183 checklists Feb 15-21: 40 species on 5%+ of 295 checklists Feb 22-28: 36 species on 5%+ of 178 checklists Mar 1-7: 38 species on 5%+ of 146 checklists Mar 8-14: 40 species on 5%+ of 122 checklists Mar 15-21: 42 species on 5%+ of 94 checklists Mar 22-31: 48 species on 5%+ of 126 checklists Apr 1-7: 44 species on 5%+ of 50 checklists Apr 8-14: 42 species on 5%+ of 44 checklists Apr 15-21: 44 species on 5%+ of 34 checklists Apr 22-30: 51 species on 5%+ of 39 checklists May 1-7: 59 species on 5%+ of 14 checklists May 8-14: 61 species on 5%+ of 33 checklists May 15-21: 42 species on 5%+ of 27 checklists May 22-31: 52 species on 5%+ of 23 checklists Jun 1-7: 36 species on 5%+ of 22 checklists Jun 8-14: 55 species on 5%+ of 14 checklists Jun 15-21: 44 species on 5%+ of 17 checklists Jun 22-30: 49 species on 5%+ of 16 checklists Jul 1-7: low data (8 checklists) Jul 8-14: 42 species on 5%+ of 16 checklists Jul 15-21: 33 species on 5%+ of 11 checklists Jul 22-31: 36 species on 5%+ of 25 checklists Aug 1-7: 53 species on 5%+ of 16 checklists Aug 8-14: 56 species on 5%+ of 16 checklists Aug 15-21: 46 species on 5%+ of 12 checklists Aug 22-31: 40 species on 5%+ of 20 checklists Sep 1-7: 48 species on 5%+ of 13 checklists Sep 8-14: 38 species on 5%+ of 18 checklists Sep 15-21: 28 species on 5%+ of 29 checklists Sep 22-30: 28 species on 5%+ of 27 checklists Oct 1-7: 47 species on 5%+ of 37 checklists Oct 8-14: 39 species on 5%+ of 25 checklists Oct 15-21: 45 species on 5%+ of 33 checklists Oct 22-31: 36 species on 5%+ of 52 checklists Nov 1-7: 49 species on 5%+ of 38 checklists Nov 8-14: 39 species on 5%+ of 85 checklists Nov 15-21: 47 species on 5%+ of 79 checklists Nov 22-30: 39 species on 5%+ of 145 checklists Dec 1-7: 40 species on 5%+ of 96 checklists Dec 8-14: 40 species on 5%+ of 90 checklists Dec 15-21: 32 species on 5%+ of 91 checklists Dec 22-31: 32 species on 5%+ of 298 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 Great Black-backed Gull 80% 2 Boat-tailed Grackle 69% 3 American Herring Gull 69% 4 Double-crested Cormorant 58% 5 Forster's Tern 58% 6 Sanderling 57% 7 Ring-billed Gull 57% 8 Common Loon 55% 9 Northern Gannet 51% 10 Black Scoter 48% 11 Ruddy Turnstone 47% 12 Surf Scoter 43% 13 Red-throated Loon 33% 14 Rock Pigeon 31% 15 Royal Tern 31% 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 Delaware.
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 .
Great Black-backed Gull80%
Boat-tailed Grackle69%
American Herring Gull69%
Double-crested Cormorant58%
Forster's Tern58%
Sanderling57%
Ring-billed Gull57%
Common Loon55%
Northern Gannet51%
Black Scoter48%
Ruddy Turnstone47%
Surf Scoter43%
Red-throated Loon33%
Rock Pigeon31%
Royal Tern31%