Map of Central and South America showing sampling locations.

<p>Approximate breeding distributions in white for blue-footed boobies and grey for Peruvian boobies; blue-footed booby sample sites indicated by black circles, Peruvian booby sample sites indicated by white circles. Isla San Ildefonso, Mexico (SI; 5), Farallon de San Ignacio, Mexico (FS; 5), El Rancho, Mexico (ER; 4), Islas Marietas, Mexico (MA; 1), La Plata, Ecuador (LP; 4), Champion Island, Galapagos (CH; 1), Seymour Island, Galapagos (SE; 1), Espanola Island, Galapagos (ES; 1), Isla Chincha Norte, Peru (CN; 6), Isla Pajaros, Chile (IP; 10). Numbers in parentheses are number of individuals sampled per colony.