Blue-footed Booby: where and when to see them

The blue-footed booby is an eastern Pacific seabird best known for the vivid feet displayed during courtship. Brown upperparts, a pale streaked head and white underparts give adults a less striking appearance above the ankles. It nests on open coastal ground and islands, but spends much of its feeding time at sea. Breeding performance is closely linked to schooling fish, so changes in ocean productivity can affect colony attendance and chick survival.

Size

76–84 cm long

Weight

1–1.8 kg

Lifespan

15–20 years

Status

Least Concern

Courtship includes exaggerated steps that lift the feet for inspection, followed by bill pointing and wing displays. Pairs nest on bare ground, where adults use their feet to warm eggs. At sea, birds locate schooling fish from the air and enter the water at speed, sometimes feeding in coordinated groups. Food shortages can intensify competition between chicks, and colonies may reduce or postpone breeding when local conditions become unfavourable. The striking blue color of their feet is derived from carotenoid pigments in their diet, signaling health and reproductive fitness. Monogamous pairs often reuse the same nest site year after year. Chicks are semialtricial, meaning they are helpless at birth and require extensive parental care for several months.

• Foot colour is influenced by dietary pigments and physical condition.
• Males prominently lift their feet during courtship.
• Adults warm eggs with their well-supplied feet.
• Females are generally larger than males and have different-sounding calls.

In the Galapagos, birds can be observed year-round, while courtship and nesting vary between colonies and with food supply. Mexican opportunities depend on regional colonies and access. Costa Rican occurrence is localized and irregular, so no general national breeding or shore-viewing season is justified. In Costa Rica, look for them mainly off the Pacific coast, particularly around offshore islands and protected areas. Mexican populations can be found year-round along the Pacific coast and in the Gulf of California. Galapagos cruises offer excellent opportunities to observe all stages of their life cycle due to the continuous breeding.

Rocky islands, dry coastal slopes and open shoreline terraces provide nesting and resting sites. Feeding occurs in productive eastern Pacific coastal waters. The species is not distributed evenly along every coastline, and many colonies lie on islands with controlled or unavailable public access. Though primarily coastal, foraging adults may travel up to 60 miles offshore to find food. Nesting colonies can range from a few pairs to several thousand individuals. These boobies often choose flat, open areas free of dense vegetation for their nesting sites.

Small schooling fish, including anchovies and sardines, dominate the diet, with other fish taken according to local abundance. Prey availability strongly influences breeding success. Adults return food to chicks by regurgitation, and older chicks may receive much larger meals than their smaller siblings. They employ a spectacular plunge-diving technique, sometimes from heights of 50 to 100 feet. Blue-footed boobies are highly opportunistic foragers, adapting their diet to the most abundant local prey. Unique to their foraging, they often dive headfirst into shallow waters, sometimes even swimming underwater to pursue fish.

Common name

Blue-footed Booby

Scientific name

Sula nebouxii

Animal group

Birds

Size

76–84 cm long

Weight

1–1.8 kg

Lifespan

15–20 years

Status

Least Concern

Identification

Adults combine bright blue feet, brown upperparts and a streaked pale head, unlike the whiter Nazca booby or predominantly dark-headed brown booby. Juveniles are similar to adults but have duller feet and a more uniform brownish head and neck. In flight, they show white underparts with dark flight feathers and a contrasting dark tail. Their pale, streaked head provides good camouflage against the bright sky during foraging dives.