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We give weights and measurements of 16 species of birds mist-netted in forest on Little Barrier Island, including 67 whiteheads (Mohoua albicilla) and 111 stitchbirds (Notiomystis cincta). The following criteria for distinguishing sexes were established. Female whiteheads weighed up to 15.9 g and males weighed 16.1 g or more. Most female stitchbirds had wings up to 92 mm long and most males had wings 95 mm or longer. Incidental observations of moult, ectoparasites and movements are recorded.