Species Profile
Blue-footed Booby
Sula nebouxii
Quick Facts
Conservation
LCLeast ConcernAlso known as: Blue-foot, Blue-footed Gannet
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Appearance
The Blue-footed Booby is a striking seabird with a distinctive appearance. Adults have a brown head, neck, and upper parts, contrasting sharply with their white underparts. Their most notable feature is their bright blue feet, which can vary in shade from turquoise to sky blue.
Males and females are similar in appearance, but females are slightly larger with bigger pupils. Juveniles have a more muted plumage, with brownish-grey feet that gradually turn blue as they mature. The birds' beaks are long, pointed, and bluish-grey in colour.
Identification & Characteristics
Colors
- Primary
- Brown
- Beak
- Blue
- Legs
- Blue
Markings
Blue feet, white belly
Tail: Long and pointed
Attributes
Understanding Attributes
Rated 0–100 based on research and observation. A score of 50 is average across all bird species. These attributes are relative and don't necessarily indicate superiority.
Habitat & Distribution
Blue-footed Boobies inhabit the eastern Pacific Ocean, ranging from the Gulf of California to Peru. They are most famously associated with the Galápagos Islands but also breed on coastal islands off Ecuador and Peru. These seabirds prefer rocky coastlines and small islands for nesting and roosting.
While they are not migratory, Blue-footed Boobies may disperse widely at sea outside the breeding season. They are rarely seen far inland, maintaining a strong connection to their coastal and marine habitats throughout the year.
Distribution
Diet
Blue-footed Boobies primarily feed on small fish such as anchovies, sardines, and mackerel. They are opportunistic hunters, using their excellent eyesight to spot prey from the air before executing their precise plunge dives.
Occasionally, they also consume squid and other small marine creatures.
Behaviour
Blue-footed Boobies are renowned for their spectacular plunge-diving behaviour. They soar high above the water, then fold their wings back and dive straight down at speeds up to 60 mph to catch fish.
On land, they are known for their comical mating dance, where males lift their blue feet high and strut to impress females.
Calls & Sounds
Blue-footed Boobies are generally quiet at sea but become more vocal during breeding. Their calls include a variety of whistles, grunts, and honking sounds.
Males produce a distinctive whistle during courtship, often described as a high-pitched 'whee-whee' or 'wh-aaaah'. Females respond with a deeper, hoarser call.
Nesting & Breeding
Blue-footed Boobies typically breed year-round, with peak activity varying by location. Courtship involves elaborate ritualised displays, including the male's famous foot-lifting dance and sky-pointing with their beaks.
Nests are simple scrapes on the ground, often on flat or gently sloping areas near cliff edges. Females usually lay 2-3 chalky blue eggs. Both parents share incubation duties, carefully shielding the eggs with their webbed feet.
Incubation lasts about 41-45 days. Chicks are born naked but quickly develop white down. They fledge after about 102 days but may continue to be fed by their parents for several months after leaving the nest.
Conservation
While currently listed as Least Concern by the IUCN, Blue-footed Boobies face threats from overfishing, which reduces their food supply, and climate change, which affects ocean temperatures and fish distribution.
Conservation efforts focus on protecting their breeding colonies and maintaining healthy marine ecosystems.
Population
Estimated: 90,000 mature individuals[3]
Trend: Decreasing[2]
Population decreasing due to overfishing and climate change
Elevation
Sea level to 100 meters
Additional Details
- Egg size:
- Approximately 5cm x 7cm
- Predators:
- Adult Blue-footed Boobies have few natural predators, but their eggs and chicks are vulnerable to gulls, frigate birds, and introduced mammals like rats and feral cats on breeding islands.
- Alarm calls:
- Loud, harsh squawk
- Breeding age:
- 3-4
- Maturity age:
- 2-3
- Feeding times:
- Throughout the day
- Major threats:
- Overfishing, habitat destruction, climate change
- Parental care:
- Both parents incubate eggs and feed chicks
- Primary calls:
- Distinctive whistle
- Social habits:
- Colonial, often found in large groups
- Egg appearance:
- Pale blue eggs, weighing around 80g
- Feeding habits:
- Dives from the air into the water to catch prey
- Breeding season:
- Varies depending on location
- Diet variations:
- Depends on availability of prey
- Fledging period:
- Approximately 3 months
- Average lifespan:
- 17
- Call description:
- Series of whistles and squawks
- Daily activities:
- Forages for food during the day
- Nesting location:
- Bare ground on islands
- Number of broods:
- One
- Incubation period:
- Around 41-45 days
- Nest construction:
- Scrape in the ground
- Migration patterns:
- Non-migratory, but can travel long distances for food
- Migratory patterns:
- Non-migratory, but may travel long distances in search of food
- Age related changes:
- Changes in coloration of feet and beak
- Prey capture method:
- Plunge diving
- Conservation efforts:
- Protected areas, monitoring of populations
- Territorial behavior:
- Males display to defend territories
- Reproductive behavior:
- Monogamous, often returning to same breeding site each year
- Special dietary needs:
- None known
- Clutch characteristics:
- 1-3 eggs
- Interaction with other species:
- Interacts with other members of its species in colonies
Birdwatching Tips
- Look for Blue-footed Boobies along rocky coastlines and islands in the eastern Pacific.
- Observe their distinctive plunge-diving behaviour from coastal viewpoints.
- Visit during the breeding season to witness their famous courtship dance.
- Bring binoculars to appreciate the details of their blue feet and facial features.
- Respect their nesting areas and maintain a safe distance to avoid disturbing the birds.
Did You Know?
- The blue colour of their feet comes from carotenoid pigments obtained from their fish diet.
- Blue-footed Boobies can dive from heights of 80 feet and reach depths of 80 feet underwater.
- They are named 'boobies' from the Spanish word 'bobo', meaning 'stupid', due to their clumsy movement on land.
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