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Waterfowl and waterbirdsCormorants and Shags
Nannopterum brasilianum
The neotropic cormorant or olivaceous cormorant is a medium-sized cormorant found throughout the American tropics and subtropics, from the middle Rio Grande and the Gulf and Californian coasts of the United States south through Mexico and Central America to southern South America, where it is called by the indigenous name of biguá. It also breeds in the Bahamas, Cuba, and Trinidad. It can be found both on coasts and in inland waters. There are at least two subspecies: N. b. mexicanum from Nicaragua northwards and N. b. brasilianum further south. In Peru, the neotropic cormorant is used by the Uru people for fishing.
Read more on WikipediaYear-round
| Week | Checklists reporting it |
|---|---|
| Jan 1–7 | 3% |
| Jan 8–14 | 3% |
| Jan 15–21 | 3% |
| Jan 22–end | 3% |
| Feb 1–7 | 3% |
| Feb 8–14 | 5% |
| Feb 15–21 | 3% |
| Feb 22–end | 4% |
| Mar 1–7 | 4% |
| Mar 8–14 | 4% |
| Mar 15–21 | 3% |
| Mar 22–end | 3% |
| Apr 1–7 | 2% |
| Apr 8–14 | 2% |
| Apr 15–21 | 2% |
| Apr 22–end | 1% |
| May 1–7 | 2% |
| May 8–14 | 1% |
| May 15–21 | 1% |
| May 22–end | 2% |
| Jun 1–7 | 1% |
| Jun 8–14 | 2% |
| Jun 15–21 | 2% |
| Jun 22–end | 1% |
| Jul 1–7 | 2% |
| Jul 8–14 | 1% |
| Jul 15–21 | 0.9% |
| Jul 22–end | 0.7% |
| Aug 1–7 | 1.0% |
| Aug 8–14 | 1% |
| Aug 15–21 | 1% |
| Aug 22–end | 0.7% |
| Sep 1–7 | 0.4% |
| Sep 8–14 | 0.4% |
| Sep 15–21 | 0.3% |
| Sep 22–end | 0.8% |
| Oct 1–7 | 0.6% |
| Oct 8–14 | 1% |
| Oct 15–21 | 1% |
| Oct 22–end (now) | 2% |
| Nov 1–7 | 2% |
| Nov 8–14 | 2% |
| Nov 15–21 | 2% |
| Nov 22–end | 3% |
| Dec 1–7 | 2% |
| Dec 8–14 | 3% |
| Dec 15–21 | 3% |
| Dec 22–end | 3% |
Share of complete checklists at each hotspot that reported it (2016–2026). Hotspots with fewer than 15 checklists are left out, and the order discounts small samples, so a hotspot with few checklists can sit below one with a lower share.
From the eBird Basic Dataset (Sep-2026), complete checklists only.