Neotropic CormorantNannopterum brasilianumWhere and when to see them

The Neotropic Cormorant is a slender, long-tailed diving bird widespread through tropical American waterways. Cornell describes a bird small for a cormorant, with a narrow bill ending in a hook. Its reference measurements are 61 centimetres long and 1,070–1,500 grams. The registered Amazon context is a 2017 cruise around Iquitos, Nauta, the Ucayali and connected tributaries in Peru. The trip list reports daily sightings, sometimes in large numbers mixed with egrets. That is strong evidence for that journey, not a year-round guarantee. Identification reference: https://www.allaboutbirds.org/guide/Neotropic_Cormorant/id. Source: https://www.allaboutbirds.org/guide/Neotropic_Cormorant/lifehistory

Size

61 cm (24 in) length; Cornell identification account.

Weight

1,070–1,500 g (37.7–52.9 oz); Cornell.

Lifespan

Species-specific lifespan not verified.

Status

Formal current global assessment not verified.

Cornell describes mostly solitary or loosely grouped hunting, with occasional coordinated groups driving fish towards shallower water. Some birds also make shallow angled dives from very low flight. A resting individual can look very different from a swimming one, particularly when its long tail is concealed. Observe whether birds are actively diving or simply sharing a perch before interpreting a gathering as a feeding flock. The Amazon trip report’s daily records do not establish a daily schedule of movements. Do not disturb a communal resting place to make the birds spread their wings or take flight.

• It has a long tail.
• The bill ends in a hook.
• Juveniles are browner than adults.
• The throat patch can have a white V-shaped border.
• It uses fresh and saline waters.
• Fish and shrimp are important foods.
• The 2017 Peruvian cruise recorded it daily.

The 2017 itinerary ran in March and reported Neotropic Cormorants daily. One trip, even one with repeated sightings, does not demonstrate a recurring March season. No multi-year local monthly series or explicit recurring viewing calendar was verified, so the Amazon months array remains empty. General tropical residency is not a substitute for local evidence. Arrange a guided side-channel excursion and ask about current accessible resting and feeding areas. The profile should preserve the value of the historical record while avoiding an invented flood-season or dry-season viewing recommendation.

The species occupies fresh, brackish and salt water, including rivers, lakes, marshes and wooded swamps. Cornell emphasises fish availability and places to rest, such as trees, rocks or embankments. The registered Peruvian excursion concerns interior river systems and side channels, not coastal habitat. Scan sheltered water and river-edge trees during a guided skiff visit. The broad habitat range explains ecological flexibility but cannot identify which tributary bend is currently occupied. Retain the Iquitos–Nauta and connected Ucayali scope rather than claiming equivalent opportunities throughout the enormous Amazon basin.

Cornell lists mainly fish and shrimp, with frogs and aquatic insect larvae also taken. Birds pursue prey underwater and may swallow small fish quickly. Larger items can be brought to the surface for handling, including removal of attached vegetation. These descriptions concern the species across its range, not a measured Peruvian diet. No prey percentages or local fish-species inventory were verified for the cruise reach. An observer may see a swallowed item without enough detail to identify it. Do not offer bait or associate every gathering with competition with local fisheries.

Common name

Neotropic Cormorant

Scientific name

Nannopterum brasilianum

Animal group

Birds

Size

61 cm (24 in) length; Cornell identification account.

Weight

1,070–1,500 g (37.7–52.9 oz); Cornell.

Lifespan

Species-specific lifespan not verified.

Status

Formal current global assessment not verified.

Identification

Cornell describes adults as dark birds with a small orange-yellow throat patch bordered by a fine white line, often forming a V-shaped outline. Breeding birds can show small white head plumes. Juveniles are browner on the head, neck and breast. The long tail and relatively slender body are useful structural clues. Compare the hooked bill with the straight, pointed bill of an Anhinga. Distant posture alone is insufficient, especially when the tail is hidden behind a branch. Photographs showing the head and throat are more useful than a dark silhouette against bright water.