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Location Antigua and Barbuda, Redonda
Central coordinates 62o 20.00' West  16o 56.00' North
IBA criteria B4ii
Area 720 ha
Altitude 0 - 250m
Year of IBA assessment 2007

Site description Redonda IBA is a small, uninhabited island situated 56 km west-south-west of Antigua, in the waters between the islands of Nevis (St Kitts and Nevis) and Montserrat (to the UK). It lies 22 km north-west of Montserrat, and 32 km south-east of Nevis. The IBA is a remnant of an extinct volcano, and protrudes steeply from the sea, mostly as sheer cliffs. It is 1.6 long and 0.5 km wide, with an area calculated at somewhere between 160 and 260 ha. Redonda has one beach (accessible by boat), but is otherwise completely surrounded by steep cliffs. The summit slopes at c.39º and the only “flat” land is a saddle of 0.4 ha at the southern end of the island, about 230 m up. This is accessible only by helicopter. Vegetation comprises coarse grasses and Opuntia cacti. A few individual short-leafed fig Ficus citrifolia cling to the western cliff-face.

Key Biodiversity This IBA is notable for its breeding seabirds. Breeding colonies of Magnificent Frigatebird Fregata magnificens, Masked Booby Sula dactylatra, Red-footed Booby S. sula and Brown Booby S. leucogaster are regionally significant. Other species breed, including over 140 Brown Noddy Anous stolidus. Burrowing Owl Athene cunicularia is thought to be resident.

Non-bird biodiversity: Of the six reptile species recorded from Redonda, three (lizards) are endemic to the island: Ameiva atrata, Anolis nubilus, and a potentially new Sphaerodactylus sp. The Endangered green Chelonia mydas and Critically Endangered hawksbill Eretmochelys imbricata turtles have both been seen in the waters around the island.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Magnificent Frigatebird Fregata magnificens resident  2007  500 individuals  poor  B4ii  Least Concern 
Sula dactylatra breeding  2007  170 individuals  poor  B4ii  Not Recognised 
Red-footed Booby Sula sula breeding  2001  300 individuals  poor  B4ii  Least Concern 
Brown Booby Sula leucogaster breeding  2007  300 individuals  poor  B4ii  Least Concern 


IUCN habitat Habitat detail Extent (% of site)
Rocky areas   -
Sea   -
Shrubland Scrub  -

Land use

Land-use Extent (% of site)
not utilised major

Acknowledgements Authors: Joseph Prosper, Victor Joseph, Andrea Otto, Shanee Prosper (Environmental Awareness Group)

Further web sources of information 

Site profile from Important Bird Areas in the Caribbean: key sites for conservation (BirdLife International 2008)

References Bacon, PR., (1991);Bunce, L., (1993);Caribbean Conservation Association. (1991);Lindsay, k. and Horwith, B. (1997);MacPherson, J. (1973);Martin-Kaye, P., (1969);Martin-Kaye, P., (1959);Pregill, GKD et al.(1994);Raffaele, H., et al. (1998); Spencer, W (1981)

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Redonda. Downloaded from on 28/10/2016

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