Almost 10% of the wildlife on the tiny raised atoll of Aldabra, 400 miles east of Africa, can be found nowhere else on earth. Owing to its isolation, Al-dabra's ecosystem has remained unique. Soaring with 7-ft. wingspreads at altitudes of more than half a mile, hundreds of thousands of frigate birds, which use Aldabra as their major Indian Ocean nesting site, blot out the rays of the sun. Thousands of rare giant land tortoises, some 4-ft. across and weighing as much as 600 Ibs., creep across the pitted coral and ridged limestone surface of the island. Tiny flightless rails...
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