Abstract
In the Pantanal of Mato Grosso hatching and rearing of the chicks of the Plumbeous Ibis (Harpiprion caerulescens) was observed towards the end of the dry season (mid-August until mid-October). Mating and nest-building was already noticed earlier in the year (March/April). A nest was found 12 m up in a tree in a sparsely wooded area. It was built of dry twigs and its cavity was lined with leaves and grass. Both partners shared in nest-building. The clutch consisted of two pale grey eggs (67 × 44 mm). The chicks hatched on 6th September. Until they were ten days old, the two young birds received constant attention from both parents who took over from each other five times a day and both fed the young. Later, the young birds were gradually left unprotected for longer periods. They fledged on the 43rd day after hatching.
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