WhenToBird

Nannopterum brasilianum · Phalacrocoracidae

When Do Neotropic Cormorants Arrive in Louisiana?

Adult Neotropic Cormorant
Photo: Ricard Busquets Reverte, CC BY 4.0 via iNaturalist

The Neotropic Cormorant is in Louisiana all year. It turns up on about 7.1% of checklists at its peak (late August) and on 3.8% in its quietest week (mid February).

When to look

PresentAll year
Peak weekAug 22-31late August
Quietest weekFeb 15-21mid February

Best: late August. Here all year. Peak: on about 7.1% of Louisiana checklists.

  1. Jancommon
  2. Febcommon
  3. Marcommon
  4. Aprcommon
  5. Maycommon
  6. Juncommon
  7. Julpeak season
  8. Augpeak season
  9. Seppeak season
  10. Octpeak season
  11. Novpeak season
  12. Decpeak season

Darker months: more checklists report it. Outlined: peak month.

0%2%4%6%8%Jan 1-7: 5.4% of 8384 checklistsJan 8-14: 4.4% of 6265 checklistsJan 15-21: 4.7% of 6825 checklistsJan 22-31: 4.2% of 8776 checklistsFeb 1-7: 4.8% of 5956 checklistsFeb 8-14: 3.9% of 6291 checklistsFeb 15-21: 3.5% of 8044 checklistsFeb 22-28: 4.2% of 5946 checklistsMar 1-7: 4.6% of 5981 checklistsMar 8-14: 4.4% of 6307 checklistsMar 15-21: 5.2% of 6747 checklistsMar 22-31: 4.8% of 10487 checklistsApr 1-7: 4.8% of 8037 checklistsApr 8-14: 4.2% of 9577 checklistsApr 15-21: 3.9% of 11372 checklistsApr 22-30: 5.0% of 14344 checklistsMay 1-7: 4.8% of 8193 checklistsMay 8-14: 4.3% of 6823 checklistsMay 15-21: 4.4% of 4818 checklistsMay 22-31: 4.1% of 6206 checklistsJun 1-7: 4.1% of 3660 checklistsJun 8-14: 4.1% of 3455 checklistsJun 15-21: 4.3% of 3084 checklistsJun 22-30: 4.3% of 3904 checklistsJul 1-7: 4.4% of 3240 checklistsJul 8-14: 4.6% of 3235 checklistsJul 15-21: 5.3% of 3167 checklistsJul 22-31: 5.6% of 4328 checklistsAug 1-7: 5.5% of 3192 checklistsAug 8-14: 6.0% of 3394 checklistsAug 15-21: 7.0% of 3502 checklistsAug 22-31: 7.7% of 5658 checklistsSep 1-7: 6.5% of 4366 checklistsSep 8-14: 5.8% of 4648 checklistsSep 15-21: 4.1% of 4369 checklistsSep 22-30: 4.1% of 6418 checklistsOct 1-7: 4.7% of 5375 checklistsOct 8-14: 5.6% of 6213 checklistsOct 15-21: 4.6% of 5553 checklistsOct 22-31: 7.5% of 8879 checklistsNov 1-7: 6.1% of 6231 checklistsNov 8-14: 5.6% of 5011 checklistsNov 15-21: 5.7% of 4856 checklistsNov 22-30: 5.5% of 6696 checklistsDec 1-7: 5.5% of 4530 checklistsDec 8-14: 5.6% of 4883 checklistsDec 15-21: 5.2% of 5833 checklistsDec 22-31: 4.5% of 9940 checklistsJanFebMarAprMayJunJulAugSepOctNovDec
Share of complete checklists reporting it, by week (4 per month). Grey bars: fewer than 10 checklists, not counted.

Frequency is the share of complete checklists in Louisiana that listed the bird, 2016–2025. It is not a head count, and it follows where and when people go birding. How to read it.

JanFebMarAprMayJunJulAugSepOctNovDec
today
Second week of November

Each county is shaded by the share of complete checklists there that listed the bird, blended with the weeks either side. Darker is more often. It follows where people watch birds, not how many birds there are. How to read it.

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Where in Louisiana

Best counties

Share of checklists at the peak
  1. Richland ParishBest the second week of August · 22 checklists that week, 835 in all63%
  2. Acadia ParishBest late June · 61 checklists that week, 4,718 in all54%
  3. Iberville ParishBest late July · 63 checklists that week, 2,343 in all40%
  4. Pointe Coupee ParishBest early September · 15 checklists that week, 593 in all32%
  5. Iberia ParishBest early July · 11 checklists that week, 1,313 in all32%
  6. Avoyelles ParishBest late March · 14 checklists that week, 432 in all29%

Best spots

Share of checklists at the peak
  1. City-Brooks Community ParkEast Baton Rouge Parish, best late August · 113 checklists that week, 1,603 in all73%
  2. Capitol LakeEast Baton Rouge Parish, best mid November · 50 checklists that week, 1,223 in all68%
  3. Shell CanalCameron Parish, best late October · 73 checklists that week, 588 in all68%
  4. Lsu Research Station (University Lake)East Baton Rouge Parish, best early October · 21 checklists that week, 426 in all67%

Busy spots report more of everything; compare the checklist counts before you drive anywhere.

Best time of day

In Louisiana, the Neotropic Cormorant is most often listed on checklists started between 6 and 8 am (6.8% of those checklists).

0%5%10%12 am: too few checklists (110) to judge1 am: too few checklists (95) to judge2 am: too few checklists (78) to judge3 am: too few checklists (145) to judge4 am: too few checklists (266) to judge5 am: too few checklists (2981) to judge6 am: 8.7% of 21115 checklists7 am: 5.8% of 38843 checklists8 am: 4.4% of 36306 checklists9 am: 4.2% of 31934 checklists10 am: 4.1% of 27208 checklists11 am: 4.7% of 20733 checklists12 pm: 4.4% of 18505 checklists1 pm: 5.0% of 17383 checklists2 pm: 5.3% of 17422 checklists3 pm: 4.8% of 17005 checklists4 pm: 4.4% of 17170 checklists5 pm: 4.3% of 12536 checklists6 pm: 3.6% of 8080 checklists7 pm: too few checklists (3798) to judge8 pm: too few checklists (676) to judge9 pm: too few checklists (311) to judge10 pm: too few checklists (206) to judge11 pm: too few checklists (93) to judge12a3a6a9a12p3p6p9p
Share of checklists started in each local hour that reported it. It reflects when people go birding as well as when birds are active. Grey hours have too few checklists (under 2% of the state’s, or under 200) to judge.
Week-by-week table
MonthDays 1-78-1415-2122-end
January5.4%4.4%4.7%4.2%
February4.8%3.9%3.5%4.2%
March4.6%4.4%5.2%4.8%
April4.8%4.2%3.9%5.0%
May4.8%4.3%4.4%4.1%
June4.1%4.1%4.3%4.3%
July4.4%4.6%5.3%5.6%
August5.5%6.0%7.0%7.7%
September6.5%5.8%4.1%4.1%
October4.7%5.6%4.6%7.5%
November6.1%5.6%5.7%5.5%
December5.5%5.6%5.2%4.5%

Neighboring states

  • Mississippi: summer visitor, peaks the second week of August
  • Texas: year-round, peaks mid April
  • Oklahoma: summer visitor, peaks the second week of August
  • New Mexico: summer visitor, peaks early April

Common questions

When do Neotropic Cormorants arrive in Louisiana?
The Neotropic Cormorant is in Louisiana all year. It turns up on about 7.1% of checklists at its peak (late August) and on 3.8% in its quietest week (mid February).
When do Neotropic Cormorants leave Louisiana?
The Neotropic Cormorant does not leave Louisiana: it is reported all year, from 3.8% of checklists in mid February to 7.1% in late August.
When is the best time to see a Neotropic Cormorant in Louisiana?
The Neotropic Cormorant is reported most often in late August, on about 7.1% of Louisiana checklists.
Where in Louisiana are Neotropic Cormorants seen most often?
By county, Richland Parish, Acadia Parish, and Iberville Parish have the highest peak reporting rates for the Neotropic Cormorant (counties with at least 200 checklists).