No abstract

The Tristan Thrush Nesocichla eremita is a little known s ecies restricted to the Tristan da Cunha Isa partial juvenile moult. There is little sex-related size dimorphism within island populations, which may reflect limited genetic variation. Tristan Thrushes are generalist foragers, using a variety of techniques to consume both animal and plant matter. Breeding occurs during the austral spring, with a single brood raised from clutches of two eggs at Inaccessible and Tristan. Three-eg clutches have only been recorded at Ni htingale Island, where they comprise about half of all clutches. Wdults perform a very soft, melodic warbhg song, which is most frequently uttered immediately rior to the spnng breeding season. Typical calls are simple, high-pitched whistles. Adults moult after the greedin season, and primary moult is completed within 80 da s. Moult commences at least one week earlier at tie coast than on the plateau (elevation 250-500 m) at lnaccessible Island. We provide a revised population estimate for Inaccessible Island, and make recommendations for the species' conservation. lands, South Atlantic Ocean. We describe several as ects o P the species' biology, based primarily on ob-