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Nearby · Lake Co.
Lesser Scaup (Aythya affinis)
(c) Ad Konings, some rights reserved (CC BY-NC), uploaded by Ad Konings · CC BY-NC 4.0 (opens in a new tab) · iNaturalist (opens in a new tab)
BirdsIn Lake County, Ohio

Lesser Scaup

Aythya affinis (Eyton, 1838)

Lesser Scaup in all of Ohio
Kingdom
Animalia
Phylum
Chordata
Class
Aves
Order
Anseriformes
Family
Anatidae
Genus
Aythya
Near Lake County

Range

Where it is recorded

Season shown in 3 of Ohio's 88 counties. Its mapped range covers 88. Explore Ohio

  • No result yet (0)
  • Within its mapped range (35)
  • Recorded, too few records for a result (46)
  • Recorded, season not shown (4)
  • Season shown (3)
Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files, 1:500,000. Range: USGS Gap Analysis Project, Species Range Maps CONUS_2001 (2018). Show as a table
Counties as a table
Lesser Scaup by Ohio county: records and mapped range
CountyRecordsIn mapped range
Adams CountyRecorded, too few records for a resultYes: migration
Allen CountyRecorded, too few records for a resultYes: migration
Ashland CountyNo qualifying records yetYes: migration
Ashtabula CountyNo qualifying records yetYes: migration
Athens CountyRecorded, too few records for a resultYes: migration
Auglaize CountyRecorded, too few records for a resultYes: migration
Belmont CountyNo qualifying records yetYes: migration
Brown CountyNo qualifying records yetYes: migration
Butler CountyRecorded, too few records for a resultYes: migration
Carroll CountyNo qualifying records yetYes: migration
Champaign CountyRecorded, too few records for a resultYes: migration
Clark CountyRecorded, too few records for a resultYes: migration
Clermont CountyRecorded, too few records for a resultYes: migration
Clinton CountyRecorded, too few records for a resultYes: migration
Columbiana CountyNo qualifying records yetYes: migration
Coshocton CountyNo qualifying records yetYes: migration
Crawford CountyRecorded, too few records for a resultYes: migration
Cuyahoga County60 · Recorded, season not shownYes: migration
Darke CountyRecorded, too few records for a resultYes: migration
Defiance CountyNo qualifying records yetYes: migration
Delaware CountyRecorded, too few records for a resultYes: migration
Erie CountyRecorded, too few records for a resultYes: migration
Fairfield CountyNo qualifying records yetYes: migration
Fayette CountyRecorded, too few records for a resultYes: migration
Franklin County20 · Season shownYes: migration
Fulton CountyNo qualifying records yetYes: migration
Gallia CountyNo qualifying records yetYes: migration
Geauga CountyRecorded, too few records for a resultYes: migration
Greene CountyRecorded, too few records for a resultYes: migration
Guernsey CountyRecorded, too few records for a resultYes: migration
Hamilton County20 · Season shownYes: migration
Hancock CountyRecorded, too few records for a resultYes: migration
Hardin CountyRecorded, too few records for a resultYes: migration
Harrison CountyRecorded, too few records for a resultYes: migration
Henry CountyNo qualifying records yetYes: migration
Highland CountyNo qualifying records yetYes: migration
Hocking CountyRecorded, too few records for a resultYes: migration
Holmes CountyNo qualifying records yetYes: migration
Huron CountyRecorded, too few records for a resultYes: migration
Jackson CountyNo qualifying records yetYes: migration
Jefferson CountyNo qualifying records yetYes: migration
Knox CountyRecorded, too few records for a resultYes: migration
Lake County20 · Recorded, season not shownYes: migration
Lawrence CountyNo qualifying records yetYes: migration
Licking CountyRecorded, too few records for a resultYes: migration
Logan CountyRecorded, too few records for a resultYes: migration
Lorain County35 · Recorded, season not shownYes: migration
Lucas County61 · Recorded, season not shownYes: migration
Madison CountyNo qualifying records yetYes: migration
Mahoning CountyNo qualifying records yetYes: migration
Marion CountyRecorded, too few records for a resultYes: migration
Medina CountyRecorded, too few records for a resultYes: migration
Meigs CountyNo qualifying records yetYes: migration
Mercer CountyRecorded, too few records for a resultYes: migration
Miami CountyNo qualifying records yetYes: migration
Monroe CountyNo qualifying records yetYes: migration
Montgomery CountyRecorded, too few records for a resultYes: migration
Morgan CountyNo qualifying records yetYes: migration
Morrow CountyNo qualifying records yetYes: migration
Muskingum CountyRecorded, too few records for a resultYes: migration
Noble CountyNo qualifying records yetYes: migration
Ottawa CountyRecorded, too few records for a resultYes: migration
Paulding CountyRecorded, too few records for a resultYes: migration
Perry CountyRecorded, too few records for a resultYes: migration
Pickaway CountyNo qualifying records yetYes: migration
Pike CountyNo qualifying records yetYes: migration
Portage CountyRecorded, too few records for a resultYes: migration
Preble CountyRecorded, too few records for a resultYes: migration
Putnam CountyNo qualifying records yetYes: migration
Richland CountyRecorded, too few records for a resultYes: migration
Ross CountyNo qualifying records yetYes: migration
Sandusky CountyNo qualifying records yetYes: migration
Scioto CountyRecorded, too few records for a resultYes: migration
Seneca CountyNo qualifying records yetYes: migration
Shelby CountyNo qualifying records yetYes: migration
Stark CountyRecorded, too few records for a resultYes: migration
Summit County89 · Season shownYes: migration
Trumbull CountyRecorded, too few records for a resultYes: migration
Tuscarawas CountyNo qualifying records yetYes: migration
Union CountyNo qualifying records yetYes: migration
Van Wert CountyRecorded, too few records for a resultYes: migration
Vinton CountyRecorded, too few records for a resultYes: migration
Warren CountyRecorded, too few records for a resultYes: migration
Washington CountyRecorded, too few records for a resultYes: migration
Wayne CountyRecorded, too few records for a resultYes: migration
Williams CountyRecorded, too few records for a resultYes: migration
Wood CountyNo qualifying records yetYes: migration
Wyandot CountyRecorded, too few records for a resultYes: migration

Season

When it is recorded

In Lake County

Not enough evidence

The weeks are still too uncertain to show a season. Based on 20 records in 8 of the 10 years from 2016 to 2025, above the minimum of 20 records from 5 different years.
Show over the bars
Recording in Lake County · records of all species each week, 29,200 in all

Records per week from 20 records in 8 of the 10 years from 2016 to 2025. Shows when people recorded it, not a season or how common it is.

Show as a table
Records of Lesser Scaup in Lake County each week, and records of all species
WeekRecords of Lesser ScaupYears recordedRecords of all species
Jan 4–100054
Jan 11–170037
Jan 18–240052
Jan 25–310082
Feb 1–71158
Feb 8–140089
Feb 15–212151
Feb 22–283154
Mar 1–70051
Mar 8–1421155
Mar 15–2111190
Mar 22–2811166
Mar 29 – Apr 400234
Apr 5–1111425
Apr 12–1811525
Apr 19–2521522
Apr 26 – May 222844
May 3–9221,247
May 10–1622647
May 17–2300950
May 24–30001,067
May 31 – Jun 6001,073
Jun 7–13001,320
Jun 14–20001,088
Jun 21–27001,052
Jun 28 – Jul 4001,305
Jul 5–11001,359
Jul 12–18001,171
Jul 19–25001,056
Jul 26 – Aug 1001,193
Aug 2–8001,090
Aug 9–1500745
Aug 16–22001,084
Aug 23–2900847
Aug 30 – Sep 500699
Sep 6–1200858
Sep 13–1900714
Sep 20–2600739
Sep 27 – Oct 300731
Oct 4–1000723
Oct 11–1700475
Oct 18–2400425
Oct 25–3100371
Nov 1–700271
Nov 8–1400271
Nov 15–2100197
Nov 22–2800182
Nov 29 – Dec 50081
Dec 6–1200111
Dec 13–190084
Dec 20–260096
Dec 27 – Jan 200289

In Ohio

Mid-December to early May, middle week Mar 15–21

Show over the bars
Recording in Ohio · records of all species each week, 1,691,199 in all

Records per week from 667 records in 10 of the 10 years from 2016 to 2025. Shows when people recorded it, not how common it is. The grey bars show how many records of all species were made here each week, so you can see when recording itself was high or low; the season is not adjusted by them.

Recorded on 420 dates. Latest record: December 2025.

Show as a table
Records of Lesser Scaup in Ohio each week, and records of all species
WeekRecords of Lesser ScaupYears recordedRecords of all species
Jan 4–101146,211
Jan 11–17655,146
Jan 18–24424,645
Jan 25–311474,698
Feb 1–71776,023
Feb 8–142465,888
Feb 15–212585,436
Feb 22–283486,846
Mar 1–754108,321
Mar 8–1447910,384
Mar 15–2168912,620
Mar 22–28541013,949
Mar 29 – Apr 4481019,661
Apr 5–11451026,860
Apr 12–1849939,925
Apr 19–2540941,623
Apr 26 – May 212656,391
May 3–913652,952
May 10–1614653,785
May 17–236457,698
May 24–305454,651
May 31 – Jun 60053,099
Jun 7–133253,700
Jun 14–202256,625
Jun 21–272255,361
Jun 28 – Jul 42258,477
Jul 5–111161,336
Jul 12–183364,722
Jul 19–251169,753
Jul 26 – Aug 12259,416
Aug 2–80059,712
Aug 9–151155,994
Aug 16–220054,328
Aug 23–290051,772
Aug 30 – Sep 50057,167
Sep 6–121159,075
Sep 13–190054,543
Sep 20–261145,860
Sep 27 – Oct 30043,180
Oct 4–100037,841
Oct 11–170030,824
Oct 18–241121,156
Oct 25–312219,021
Nov 1–73314,172
Nov 8–143212,621
Nov 15–21117,965
Nov 22–28438,136
Nov 29 – Dec 5446,083
Dec 6–12646,004
Dec 13–19555,423
Dec 20–261255,661
Dec 27 – Jan 21768,459

What these results show

These results show when people recorded a species, not when or where it occurs. Missing weeks and low counts do not mean absence or scarcity, and counts are not abundance. Contributed records reflect where, when and what people chose to observe.

Identification

How to identify it

Often confused with

  • Greater Scaup Aythya marilaOften confused in Ohio: 27 identifications in Ohio named one where the other was meant
  • Ring-necked Duck Aythya collarisOften confused in Ohio: 12 identifications in Ohio named one where the other was meant
  • Redhead Aythya americana71 identifications worldwide named one where the other was meant
  • Mallard Anas platyrhynchos43 identifications worldwide named one where the other was meant
  • Common Goldeneye Bucephala clangula39 identifications worldwide named one where the other was meant

From iNaturalist’s similar-species counts, refreshed monthly: confusions in Ohio first, then worldwide. Only species with an Ohio result are listed.

When each is reported

  • All recordsUsually mid-December to early May, middle week mid-March · 667 records
  • Reported as maleUsually early February to late April, middle week mid-March · 22 records

Not every photo is marked with a sex or a sign, so these show when people reported each, not when it happens.

Land cover where it is recorded

Land coverIts recordsAll Ohio records
Open water65%3%
Developed25%49%
Farmland4%11%
Forest2%31%
Grassland and shrub2%0.9%
Wetland2%5%
Barren0.8%0.6%

From 257 records placed within 100 m, beside all Ohio records placed the same way. People record where they go, so this shows where records come from, not where the species lives. Land cover: USGS Annual NLCD, 2025 (opens in a new tab)

Sources

Where these results come from

  • Records from iNaturalist research-grade observations and expert-identified GBIF datasets, CC0, CC BY and CC BY-NC. Sources
  • Seasons use the published method and its evidence thresholds. Methods
  • See it on iNaturalist (opens in a new tab)OpenPhenology is independent and not affiliated with iNaturalist.

Records behind the Ohio result

667 records from 2 datasets.

To cite: the GBIF download doi:10.15468/dl.y2jkt8 (opens in a new tab).

A spreadsheet (CSV) with a link to each record, on iNaturalist or GBIF. Records whose location was hidden by the observer or the source are counted but not linked.