The Iago sparrow (Passer iagoensis), also known as the Cape Verde or rufous-backed sparrow, is a passerine bird of the sparrow family Passeridae. It is endemic to the Cape Verde archipelago, in the eastern Atlantic Ocean near western Africa. Females and young birds have brown plumage with black marks above, and a dull grey underside, and are distinguished from other species of sparrow by their large, distinct supercilium. Males have a brighter underside and bold black and chestnut stripes on their head. At 12.5–13 centimetres (4.9–5.1 in) long, it is a smaller sparrow. This bird's vocalisations are mostly variations on its chirp, which differ somewhat between males and females.
The Iago sparrow was once thought to be most closely related to the rufous sparrows, a group of species within the genus Passer which live in similar habitats on continental Africa. Though the Iago sparrow is closest to the rufous sparrows in appearance, it has a number of crucial differences in morphology and behavior, and is separated by thousands of kilometres. It may in fact be more closely related to the house sparrow and Spanish sparrow. In Cape Verde it occurs on all but one island, and on most of them it is quite common. The Iago sparrow occurs in most of the habitats that are available in its range, such as lava plains, rocky hills, and gorges; however, the house sparrow and Spanish sparrow are typically present instead in denser settlements and richer cultivated areas respectively. Because the Iago sparrow is not under any serious threats, it is assessed as Least Concern on the IUCN Red List.
^BirdLife International (2016). "Passer iagoensis". IUCN Red List of Threatened Species. 2016: e.T22718202A94572225. doi:10.2305/IUCN.UK.2016-3.RLTS.T22718202A94572225.en. Retrieved 11 November 2021.
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Gould as the type specimen of Passer iagoensis, the Cape Verde sparrow or Iagosparrow. Herbert 1991, pp. 164–170. "Letter no. 171, Charles Darwin to...
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Monmouth, place Edwin in the kingdom of Gwynedd, fostered by king Cadfan ap Iago, so allowing biblical parallels to be drawn from the struggle between Edwin...
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