Lava Gull: where and when to see them

The lava gull is a dark-plumaged gull found only in the Galápagos Islands. Its small global population and coastal habits make it a notable endemic, although it is not present at every visitor beach. Sooty feathers blend surprisingly well with volcanic shorelines, while pale eye crescents add contrast to the face. Unlike many familiar gulls, it usually breeds in widely separated pairs rather than forming densely packed nesting colonies.

Size

51–55 cm long

Weight

About 380 g

Lifespan

Not reliably established

Status

Vulnerable

Lava gulls patrol beaches, harbor margins and rocky shores, walking methodically or making short flights between feeding patches. They are opportunistic and may investigate food left by other animals. Breeding pairs defend stretches of coast, using calls and displays to discourage intruders. Nests are placed on the ground, sometimes among sparse vegetation. Their scattered nesting pattern means a quiet-looking beach can still contain a vulnerable nest or a concealed chick. They are considered solitary nesters, typically forming loose pairs rather than dense colonies, which contributes to their scattered nesting pattern. Their territorial displays often involve a distinctive 'long call' posture where the head is thrown back. Adults are known to vigorously defend their nesting sites against perceived threats, including other gulls and larger birds.

• It is among the world's rarest gulls.
• Its entire natural range lies within the Galápagos archipelago.
• Pairs generally nest separately rather than in dense gull colonies.
• The inside of the mouth is vividly colored and becomes visible during calling displays.

Lava gulls are resident and may be encountered in any month at suitable occupied shores. Nesting is not neatly restricted to one archipelago-wide season. Visitor conditions and local beach access are therefore more useful planning factors than a claimed annual gull peak. While breeding occurs year-round, there are slight peaks in activity during the cooler, drier season (June to December), which might offer more opportunities to observe nesting behavior. Observing young birds or fledglings can also be a good indicator of recent nesting activity. Their presence is generally consistent, making them a reliable sighting on coastal excursions.

They occupy sandy beaches, lava shorelines, sheltered bays and coastal lagoons, often remaining close to the sea. Nesting requires relatively undisturbed ground near feeding areas. Human waterfronts may attract birds, but waste and introduced predators create additional risks. They are endemic to the Galapagos Archipelago, found on most major islands within the central and western parts of the group. Despite their name, they are not exclusive to lava formations, utilizing various coastal terrains suitable for foraging and nesting. Their reliance on coastal areas means they rarely venture far inland.

Food includes small fish, crustaceans, other shoreline invertebrates, carrion and scraps. Lava gulls also take eggs or young animals opportunistically. They gather food along the water's edge and at the surface rather than relying on deep pursuit. In addition to natural food sources, they are known to scavenge human refuse, which can be a significant food source near settlements. This adaptability allows them to exploit a wider range of food opportunities compared to more specialized coastal birds. They have also been observed preying on seabird eggs and hatchlings when available.

Common name

Lava Gull

Scientific name

Leucophaeus fuliginosus

Animal group

Birds

Size

51–55 cm long

Weight

About 380 g

Lifespan

Not reliably established

Status

Vulnerable

Identification

The uniformly dark adult plumage and pale eye crescents distinguish it from the paler, white-bellied swallow-tailed gull with its conspicuous red eye ring. The lava gull is the rarest gull in the world, a key identification point being its dark, sooty-brown plumage that can appear almost black in some light. Juveniles are even darker, with a more mottled appearance, and lack the adult's pale eye crescent. Their distinctive call, a low 'krow-krow' or 'whew', can also aid in identification, especially when visibility is poor.