Iago SparrowPasser iagoensisWhere and when to see them

The Iago sparrow is a small passerine endemic to the Cape Verde archipelago. It is one of the islands' characteristic land birds, occurring in dry natural habitats as well as cultivated areas and settlements. Males combine dark facial markings with warm chestnut tones, while females are much plainer. Its ability to exploit scattered food and nesting opportunities helps it occupy landscapes where rainfall and vegetation can be highly unpredictable.

Size

12–13 cm (4.7–5.1 in) long

Weight

20–25 g (0.71–0.88 oz)

Lifespan

Not reliably established

Status

Least Concern

These sociable sparrows forage in groups, moving between the ground, low vegetation and buildings while exchanging short calls. They pick up seeds and small invertebrates and readily investigate human-modified habitats. Nesting may occur in loose colonies, with nests placed in cavities, rock crevices or structures. Breeding activity responds to local conditions, particularly rainfall and food availability, so a single rigid calendar does not describe every island or year. Courtship displays involve the male puffing out his bib and singing short, chirping songs. They exhibit cooperative breeding behaviors within loose colonies, sometimes utilizing the same nesting sites over multiple seasons.

• Its natural range is confined to Cape Verde.
• The name Iago refers to Santiago, one of the archipelago's islands.
• Nests can occupy crevices in both natural rock and human structures.
• Rainfall-driven changes in food can influence the timing of nesting.

The species is resident, so suitable habitat can be checked throughout the year. Drier months often make coastal travel and walking easier. Rainfall can influence nesting and local food abundance, but the main visitor season should not be interpreted as its breeding season. Breeding activity is opportunistic and strongly linked to rainfall events, which can occur at various times of the year. While generally resident, some local movements may occur in response to food scarcity or to seek suitable breeding sites.

Typical habitat includes arid scrub, rocky slopes, cultivated plots, village edges and coastal settlements. Trees and buildings provide shelter and nesting sites within otherwise open country. It occurs across much of Cape Verde but is not equally abundant on every island. They are highly adaptable and thrive in human-modified landscapes, often being the most common bird in urbanized areas. Though widespread, their density can vary significantly depending on island topography and resource availability.

Seeds and grains form much of the diet, supplemented by small insects and other invertebrates. Birds forage on bare ground and among low plants, sometimes taking food around settlements. Animal prey becomes particularly useful when adults are provisioning growing nestlings. Insects are a crucial protein source, especially during the breeding season when provisioning young. They demonstrate opportunistic feeding, readily consuming scraps and discarded food items in human settlements.

Common name

Iago Sparrow

Scientific name

Passer iagoensis

Animal group

Birds

Size

12–13 cm (4.7–5.1 in) long

Weight

20–25 g (0.71–0.88 oz)

Lifespan

Not reliably established

Status

Least Concern

Identification

Males show a dark crown and bib with chestnut behind the eye, unlike the grey-crowned male house sparrow and the more heavily streaked Spanish sparrow. Females are duller and lack the distinct head patterns of the male, appearing more uniformly streaked brown. Their small size and characteristic sprightly movements also help distinguish them from other Cape Verdean passerines.