Abstract
Incubation, handrearing and motherrearing of 5 male Andean Cocks of the Rock ( Rupicola peruviana) in Wuppertal Zoo is described, in particular the development of the juvenile plumage to adulthood, and the change of colour of the beak and the iris of the eye. Incubation lasted 26–28 days. The mother-reared nestling fledged after 28 days. The young male Cock of the Rock attained full adult plumage at the age of 18 months, not at 3 years as Del Hoyo et al. (2004) describe from free-living Cocks of the Rock. A report on the supposed world's first breeding of the Purple-throated Fruitcrow ( Querula purpurata) is given. The incubation period was 25 days.
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