Data from: Post-juvenile moult extent is largely driven by habitat openness not by time constraints across New Zealand native passerines

Mass of moulted wing-feathers and occurrence of moulted primaries. Feather mass is a proxy of investment in plumage maintenance (e.g. to protect from UV radiation). We obtained percentage of wing-feather moult multiplying the mass of each feather by its moult score and dividing the sum by the total wing-feather mass. Since wing-feather masses for New Zealand passerines are not available, we surrogated published information from Palearctic passerine species with known wing-feather masses . We paired each of the 18 New Zealand passerine species with one Palearctic species of similar body size and wing shape. For example, for the Australasian pipit we used the wing-feather masses from the tree pipit Anthus trivialis, while for the two Acanthisittidae species we used the wing-feather masses from the Eurasian wren Troglodytes troglodytes. Here, you can find the moult data for the fernbird (post-juvenile moult only) and the individual masses of upper-wing coverts, alula feathers, and remiges of the surrogate species used. Species name is shown as the first three letters of the genus followed by the first three letters of the specific epithet. For example: TROTRO stands for Troglodytes troglodytes.