Phalacrocorax auritus
Silhouette: Andy Wilson · PhyloPic
In 3 days ~60% in a week ~90%
The double-crested cormorant (Nannopterum auritum) is a member of the cormorant family of water birds. It is found near rivers and lakes and in coastal areas and is widely distributed across North America, from the Aleutian Islands in Alaska down to Florida and Mexico. Measuring 70–90 cm (28–35 in) in length, it is entirely black except for a bare patch of orange-yellow facial skin and some extra plumage that it exhibits in the breeding season when it grows a double crest in which black feathers are mingled with white. Five subspecies are recognized. It mainly eats fish and hunts by swimming and diving. Its feathers, like all cormorants, are not waterproof, and it must dry them out after spending time in the water. Once threatened by the use of DDT, the numbers of this bird have increased markedly in recent years.
The double-crested cormorant was described by René Primevère Lesson in 1831. It was formerly classified in the genus Phalacrocorax, but a 2014 study supported reclassifying it and several other American cormorant species into the genus Nannopterum. The IOC followed this classification in 2021.
Its scientific genus name is derived from the Greek words νᾶνος... Wikipedia →
Recording0:08
United States · 2023
© riley_j · iNaturalist · CC BY-NC 4.0
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United States · 2025
© Justin Donahue · iNaturalist · CC BY 4.0
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Canada · 2025
© sankarancls · iNaturalist · CC BY-NC 4.0
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Tijuana | 🇲🇽 México | |
| 2 | San Diego | 🇺🇸 United States | |
| 3 | San Francisco | 🇺🇸 United States | |
| 4 | Los Angeles | 🇺🇸 United States | |
| 5 | New York City | 🇺🇸 United States | |
| 6 | Seattle | 🇺🇸 United States | |
| 7 | Miami | 🇺🇸 United States | |
| 8 | Sacramento | 🇺🇸 United States | |
| 9 | Denver | 🇺🇸 United States | |
| 10 | Mesa | 🇺🇸 United States |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | National Zoological Park | 🇺🇸 United States | |
| 2 | Denver Zoo | 🇺🇸 United States | |
| 3 | Silver Springs | 🇺🇸 United States | |
| 4 | Zoo Miami | 🇺🇸 United States | |
| 5 | Brookfield Zoo | 🇺🇸 United States | |
| 6 | Detroit Zoo | 🇺🇸 United States | |
| 7 | Jacksonville Zoo and Gardens | 🇺🇸 United States | |
| 8 | Audubon Zoo | 🇺🇸 United States | |
| 9 | Saint Louis Zoo | 🇺🇸 United States | |
| 10 | Cameron Park Zoo | 🇺🇸 United States | |
| 11 | Tracy Aviary | 🇺🇸 United States | |
| 12 | Florida Aquarium | 🇺🇸 United States | |
| 13 | Mote Marine Laboratory | 🇺🇸 United States | |
| 14 | Flint RiverQuarium | 🇺🇸 United States | |
| 15 | Seaside Seabird Sanctuary | 🇺🇸 United States |
Possible
About 30% of wildlife watchers report a Double-crested Cormorant sighting in Boston on a given day, based on 16,767 verified sightings from GBIF citizen-science data. It is the 30th most-seen of the 283 birds we can rate there. Over three days the chance rises to about 60%, and over a week to about 90%, if each day is a fresh chance.
August
In that month about 50% of wildlife watchers report a Double-crested Cormorant in Boston on a given day, against under 5% in January and February, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Double-crested Cormorant sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
15th of 33
Of the 33 cities where we can rate Double-crested Cormorant sightings, Boston ranks 15th at about 30%. The best odds are in Tijuana (México, about 50%), San Diego (United States, about 40%) and San Francisco (United States, about 40%).
GBIF citizen-science records
It is estimated from how often the Double-crested Cormorant is recorded against all the birds logged in Boston (16,767 verified sightings), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
