Behaviour
The Iago Sparrow is gregarious, usually breeding in small colonies, and forming large flocks outside the breeding season. It is not shy, allowing humans to approach it even at its nest. It is attracted to water, which is scarce in its habitat. It often is seen dust bathing in small groups.
The adult sparrow feeds mainly on seeds, but also on insects and shoots. Nestlings, by contrast, feeds almost exclusively on insects. It forages mostly on the ground, moving restlessly and close to the ground. It flocks with other birds, even warblers such as the Blackcap and the Cape Verde Warbler.
This sparrow's breeding habits are not well known, though they are believed to be similar to those of the House Sparrow. Its breeding season begins in August and September with the onset of the humid season. The Iago Sparrow builds its nest in a variety of habitats, including lava plains, cliffs, and gardens. The nest is made of grass, lined with hair and feathers and usually built in a hole in a cliff or wall. The average clutch is three to five eggs.
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