Brown Noddy
Brown Noddy
Anous stolidus
At a Glance
Most terns are white with dark caps, and have forked tails. The Brown Noddy, like an anti-tern, is dark with a white cap, and has a wedge-shaped tail. At sea it flies low, with deep wingbeats; when perched, it has a solemn and lethargic look. Widespread in tropical oceans, including around Hawaii. Birders know this species mostly from its colony at the Dry Tortugas, Florida, where it nests alongside the much noisier and more numerous Sooty Tern.
All bird guide text and rangemaps adapted from Lives of North American Birds by Kenn Kaufman© 1996, used by permission of Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Category
Gull-like Birds, Gulls and Terns
IUCN Status
Least Concern
Habitat
Coasts and Shorelines, Open Ocean
Region
Florida, Mid Atlantic, Southeast, Texas
Behavior
Direct Flight, Rapid Wingbeats
Population
1.600.000
Range & Identification
Migration & Range Maps
Movements not well known. Present around the Tortugas January to October. May be seen well offshore elsewhere in Florida waters during warmer months. Sometimes driven to shore or inland in southeast by tropical storms.
Description
15" (38 cm). W. 32 (81 cm). Mostly dark brown, with a wedge-shaped tail. White-capped adults are easily recognized; immatures show less white, mainly on forehead.
Size
About the size of a Crow
Color
Brown, White
Wing Shape
Pointed, Short, Tapered
Tail Shape
Long, Notched, Pointed, Wedge-shaped
Songs and Calls
Low cah, similar to call of a young crow.
Call Pattern
Flat, Simple
Call Type
Chatter, Rattle
Habitat
Tropical oceans. Found over warm seas, often very far from land. Seldom comes near mainland coast anywhere, except when driven there by storms. Nests on tropical islands, in bushes on beach or on rocky ledges.
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Behavior
Eggs
One. Pale buff, lightly spotted with reddish brown and pale lavender. Incubation is by both sexes, 35-38 days.
Young
Both parents feed young, by regurgitation. At Tortugas, adult noddies often forage closer to colony than Sooty Terns, feeding their young more often, and the young mature faster (able to fly at 6-7 weeks).
Feeding Behavior
Forages in flight by dipping to take items from surface of water. Sometimes makes shallow plunges for prey just below surface, but not forceful plunge-dives like some terns. Rarely settles on water to feed. At Tortugas, adults nesting close together in colony may fly out to sea to forage together.
Diet
Small fish. As far as known, feeds on small fish, often catching them when schools of large predatory fish drive the smaller ones to the surface.
Nesting
Courtship involves bowing and nodding movements (leading to name of "Noddy"); also swift high flight by pairs. Nest: On Tortugas, nest site is in bay cedar or cactus, a few inches to 12' above ground. Nest (built by both sexes) is a platform of sticks and seaweed, often with bits of rock or coral added as lining. Nests may be re-used and added to every year, growing to large size. In some other regions, species nests on cliffs and among stone crevices, laying eggs on bare rock.
Climate Vulnerability
Conservation Status
Formerly more numerous on Tortugas, numbers probably hurt by commercial egg harvesting in 19th century. Current numbers there apparently stable. Widespread and common in tropical seas around the world.