|Location||Cape Verde, São Nicolau|
|Central coordinates||24o 36.00' West 16o 37.00' North|
|IBA criteria||A1, A2, A4ii, A4iii|
|Altitude||0 - 164m|
|Year of IBA assessment||2001|
Site description The island of Raso is primarily flat, with some small peaks in central-northern parts of the island, which rise to a maximum of 164 m. The entire south-western area is a flat, rocky plain, parts of which are covered with large boulders. Dry riverbeds cross the island. There is little vegetation except for a grassy area in the south-west. The coastline is entirely composed of rocky cliffs.
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Cape Verde Shearwater Calonectris edwardsii||breeding||1988||2,500-3,750 breeding pairs||-||A4ii||Near Threatened|
|Red-billed Tropicbird Phaethon aethereus||breeding||1986||25-40 breeding pairs||-||A4ii||Least Concern|
|Raso Lark Alauda razae||resident||1996||present [units unknown]||-||A1, A2||Critically Endangered|
|Iago Sparrow Passer iagoensis||resident||1996||present [units unknown]||-||A2||Least Concern|
|A4iii Species group - seabirds||breeding||1988||10,000 individuals||unknown||A4iii|
|Protected area||Designation||Area (ha)||Relationship with IBA||Overlap with IBA (ha)|
|Ilheu Raso||Nature Reserve||700||is identical to site||700|
|Land-use||Extent (% of site)|
|nature conservation and research||-|
|Notes: Collection of eggs and young of seabirds.|
Other biodiversity The endemic giant skink Macroscincus coctei is thought to have become extinct early in the twentieth century (see site CV010). The endemic geckos Tarentola caboverdiana and T. gigas still occur in good numbers. Other lizards include Mabuya stangeri and Hemidactylus bouvieri.
References Hazevoet (1989, 1994, 1995), Ratcliffe et al. (1999), Schleich (1982).
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: Ilhéu Raso. Downloaded from http://www.birdlife.org on 06/12/2013
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