Blue-footed Booby

Least Concern

Sula nebouxii

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About

The Blue-footed Booby is a distinctive seabird known for its bright blue feet, which play a crucial role in courtship displays. These medium-sized boobies are expert plunge-divers, feeding primarily on fish. They are found along the Pacific coasts of Central and South America, with a significant population in the Galápagos Islands.

Size & lifespan

Length: 76-84 cm (30-33 in)
Wingspan: 137-152 cm (54-60 in)
Weight: 1.3-1.8 kg (2.9-4.0 lbs)
Lifespan: Up to 17 years in the wild
Diet: Carnivore (Piscivore)

Physical characteristics

Plumage: Adults have a white head and neck streaked with light brown, a brown back and wings, and a white belly. The tail is dark brown. The most striking feature is their bright turquoise to deep blue feet.
Beak shape: The beak is conical, pointed, and serrated along the edges, adapted for grasping slippery fish. It is typically grayish-blue or greenish-gray.
Eye color: Pale yellow to yellowish-white, with a dark pupil. Males tend to have smaller pupils than females, giving their eyes a more intense yellow appearance.
Leg color: Vivid blue, ranging from turquoise to deep azure.
Distinguishing features: The bright blue feet are unmistakable. They also have a distinctive white patch at the base of the bill and a dark mask around the eyes.
Juvenile appearance: Juveniles have a duller, browner plumage overall, with less distinct streaking on the head and neck. Their feet are a duller, grayish-blue, not as vibrant as adults. The bill is also duller.
Seasonal changes: No significant seasonal plumage changes. The intensity of the blue feet can vary with health, diet, and breeding condition, becoming brightest during courtship.
Sexual dimorphism: Females are slightly larger and heavier than males. Their pupils appear larger, giving their eyes a darker overall appearance. Males tend to have brighter blue feet, especially during courtship. Females also have a slightly different vocalization.

How to identify

1
Blue Feet
The most obvious and defining characteristic. Look for vibrant turquoise to deep blue webbed feet, especially prominent during courtship displays.
2
Plumage Pattern
Observe the brown back and wings contrasting with a white belly. The head and neck are whitish with fine brown streaking.
3
Eye Color and Mask
Note the pale yellow eyes with a dark mask around them. Males have smaller pupils, giving a more intense yellow appearance.
4
Beak Color
The grayish-blue or greenish-gray conical bill is also a good identifier.
5
Behavior (Plunge Diving)
Watch for their characteristic high-altitude plunge dives into the ocean to catch fish.
6
Courtship Dance
If observed during breeding season, the male's elaborate 'foot-waving' dance is unmistakable.

Habitat & range

Biomes: Coastal marine environments, tropical and subtropical oceans.
Geographic range: Pacific coast of Central and South America, from Baja California, Mexico, south to northern Peru. The largest breeding populations are found in the Galápagos Islands.
Elevation range: Primarily sea level, foraging in coastal waters and nesting on offshore islands or coastal cliffs.
Preferred environments: Rocky coasts, offshore islands, and open ocean waters rich in schooling fish. They require flat or gently sloping ground for nesting.

Behavior

Activity time: Diurnal, active during daylight hours for foraging and breeding.
Feeding habits: Blue-footed Boobies are spectacular plunge-divers. They fly high above the water, spot prey, and then dive headfirst into the ocean, often from heights of 10-30 meters (33-98 ft), to catch fish. They often hunt in groups, coordinating their dives. Their diet consists mainly of small schooling fish like sardines, anchovies, and mackerel, as well as squid.
Social behavior: Highly colonial, especially during breeding season, forming large nesting colonies. They often forage in groups. Courtship involves elaborate displays, most notably the 'foot-waving' dance.
Flight pattern: Strong, direct flight with powerful wing beats. They can soar for extended periods on updrafts. When foraging, they fly with their heads pointed downwards, scanning the water.
Migration pattern: Generally resident within their breeding range, but some individuals, particularly non-breeders and juveniles, may disperse along the coast after the breeding season. They are not considered long-distance migrants.
Territoriality: They defend small nesting territories within the larger colony, primarily around the nest site itself. Displays and vocalizations are used to deter intruders.

Song & calls

Song: Blue-footed Boobies do not have a complex song. Their vocalizations are primarily calls.
Call: Males produce a thin, whistling sound, often described as a 'whistle' or 'piping'. Females emit a louder, harsher, and more guttural 'honk' or 'squawk'. These calls are used during courtship, territorial defense, and communication within the colony.
When they vocalize: Most vocal during courtship displays and when interacting with mates or rivals at the nesting colony.

Breeding & reproduction

Breeding season: Breeding can occur year-round in the Galápagos Islands, often peaking after periods of abundant food. On the mainland, it is more seasonal, typically from March to September.
Nesting habits: They are ground-nesters, creating a shallow depression in the bare ground, often surrounded by a ring of guano and pebbles. Nests are typically in open areas, allowing for easy take-off and landing.
Clutch size: 1-3 eggs, with 2 eggs being common.
Egg description: Typically 1-3 eggs, dull white or pale blue, often stained brown by guano. Eggs are elliptical, measuring approximately 65 x 45 mm.
Incubation period: Approximately 41-45 days. Both parents share incubation duties.
Fledging period: Chicks fledge (become capable of flight) at around 100-105 days (3.5 months) after hatching. They remain dependent on parents for feeding for several weeks to months post-fledging.
Parental care: Both parents participate in incubation, brooding, and feeding the chicks. They employ 'siblicide' in some cases, where the older, stronger chick may outcompete or kill its younger sibling, especially when food is scarce.

Where to find

Galápagos Islands

The Galápagos Islands are the best place to observe Blue-footed Boobies up close, as they are abundant and relatively unafraid of humans.

Coastal Ecuador and Peru

Breeding colonies can be found on offshore islands and coastal cliffs along the Pacific coast of Ecuador and Peru.

Baja California, Mexico

Northernmost extent of their range, with some breeding colonies on islands in the Gulf of California.

Field tips

Look for colonies. Blue-footed Boobies are colonial nesters. Look for large groups of birds on flat, open ground near the coast or on offshore islands.
Observe feeding behavior. Scan the ocean for birds flying high and then suddenly plunge-diving. This is a strong indicator of booby activity.
Bring binoculars. While often approachable in the Galápagos, binoculars will enhance views of plumage details and behaviors, especially the foot color.
Visit during breeding season. To witness the famous courtship dance and vibrant foot colors, visit during the local breeding season (year-round in Galápagos, more seasonal elsewhere).

Similar species

Peruvian Booby

Sula variegata

The Peruvian Booby has a darker, more mottled brown head and neck, lacking the white streaking of the Blue-footed Booby. Its feet are grayish-blue, not the vibrant blue of S. nebouxii. It also has a more restricted range, primarily along the coast of Peru and northern Chile.

Masked Booby

Sula dactylatra

The Masked Booby is larger and almost entirely white, with black flight feathers and tail. It has a distinctive black 'mask' around its yellow bill and dark gray feet. Its plumage is much whiter than the Blue-footed Booby.

Nazca Booby

Sula granti

Formerly considered a subspecies of the Masked Booby, the Nazca Booby is also predominantly white with black flight feathers. It has a pinkish-orange bill and dark gray feet. It lacks the blue feet and brown back of the Blue-footed Booby.

Quick facts

Key Feature:: Bright blue feet
Diet:: Fish (plunge-diver)
Habitat:: Coastal marine, offshore islands
Social Behavior:: Colonial breeder
Conservation Status:: Least Concern

Fun facts

The intensity of a male's blue feet is an indicator of his health and diet, and females prefer males with brighter feet.
During courtship, males perform an elaborate 'foot-waving' dance, lifting their blue feet high to impress the female.
Blue-footed Boobies have specialized nostrils that are permanently closed, forcing them to breathe through the corners of their mouths. This adaptation helps them during high-speed plunge dives.
They can dive to depths of up to 25 meters (82 ft) and stay underwater for several minutes.
The name 'booby' comes from the Spanish word 'bobo', meaning 'clown' or 'foolish', referring to their somewhat clumsy gait on land.

Scientific classification

Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Suliformes
Family: Sulidae
Genus: Sula
Species: Sula nebouxii

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