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On the body mass of the Montane and Pectoral Nightjars

Jackson (2000) recently published a key to the identification of the Afrotropical nightjars. Absent from the key, however, were data on body mass. A summary of these data is consequently presented here (Table 1) for the Montane Nightjar, Caprimulgus poliocephalus, and the Fiery-necked (Pectoral) Nightjar, C. pectoralis. English and scientific names and sequence follow Jackson (2002). Although there are published data available on the body masses of the two species, most of these could not be included in the statistical summaries that follow, owing to the absence of means, standard deviations and/or sample sizes. Data used were consequently from published sources where these variables were included, from museum specimen labels and from my own unpublished records.