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The poor survival rate of immature northern bald ibises Geronticus eremita during their first years spent outside the natal site is driving the last known wild colony of the migratory eastern population to extinction. To inform emergency conservation action for this Critically Endangered species we investigated the distribution range and behaviour of immature birds in passage and wintering areas, and the threats to which they are subject. We integrated recent satellite telemetry data with visual observations spanning 130 years. We assessed threats across the range, using satellite tracking and field surveys. Our results show that during the years before they return to the natal site in Syria, immature northern bald ibises reside away from the recently identified adult wintering site in the central Ethiopian highlands. They occur mainly across the northernmost 70-80% of the adult migratory range. Historical records suggest that immature birds spend more time along the western Arabian Peninsula now than in the past. This range shift exposes them for longer periods to threats, such as hunting and electrocution on power lines, which are absent from the wintering site used by adult birds. We suggest that other threatened and declining bird species sharing the same flyway probably face the same threats during migration.

Since its discovery in 2002 the small colony of northern bald ibis Geronticus eremita in the central Syrian desert remains at perilously low numbers, despite good productivity and some protection at their breeding grounds. The Syrian birds are migratory and return rates of young birds appear to have been poor but because the migration route and wintering sites were unknown little could be done to address any problems away from Syria. Satellite tracking of three adult birds in 2006-2007 has shown they migrate through Jordan, Saudi Arabia and Yemen to the central highlands of Ethiopia. The three tagged birds and one other adult were found at the wintering site but none of the nine younger birds that also left Syria were with them. At least four birds wintered elsewhere because they returned to the colony the following spring. The return migration followed the western shore of the Red Sea through Eritrea to Sudan before crossing the Red Sea into Saudi Arabia, then northwards to Syria. The adults appeared to be at low risk on the wintering site although we recommend protection. Threats along the migration route now need to be assessed and mitigated, and further effort made to determine the movements of subadults and young birds.

In this paper we describe our survey methodology for detecting old nesting sites and an extant colony in Syria, and analyse the causes of the decline and current threats. This study was undertaken within the framework of an Italian-funded, FAO-implemented project (GCP/SYR/ 009/ITA) based in Palmyra, Syria, with the aim of assisting the Syrian authorities in promoting biodiversity conservation and developing the first operational protected area, Al Talila, in the country. The search for a possible northern bald ibis colony began in March 2002 on the basis of an account given by a local hunter. A total of 33 field surveys were carried Abstract The eastern population of the northern bald ibis Geronticus eremita had been presumed extinct following the loss of the colony in Birecik, Turkey, in 1989. However, occasional sightings of birds in Yemen, Eritrea, Saudi Arabia and Israel during the 1980s and 1990s suggested that there was still a colony somewhere in the Middle East. Intensive field surveys in spring 2002, based on the knowledge of Bedouin nomads and local hunters, revealed that the species has never become completely extinct on the Syrian desertic steppe. Following systematic searches 15 old nesting sites were found, one of them still hosting an active breeding colony of seven individuals. The species appears to have been relatively common in the area until 20 years ago, when a combination of overexploitation of rangelands and increasing hunting pressure initiated a dramatic decline.