10.18710/NJEDNQHalgunset, Eirik SandvikEirik SandvikHalgunset0009-0003-8908-7818https://ror.org/00wge5k78DataverseNO2025Earth and Environmental SciencesBiologyReproduction traitsBirds of preyHawksEaglesFalconsOwlsCorvidsBorealTundraArcticSpecialistGeneralistRaptorEcologyMellard, JaradUiT The Arctic University of NorwayUiT The Arctic University of NorwayMellard, JaradJaradMellardUiT The Arctic University of Norway2025-05-082026-02-032025-01-01/2025-05-01Litterature data5437608677177410text/plaintext/plaintext/comma-separated-valuestext/plain2.0CC0 1.0This dataset contains reproduction data for 30 raptors occurring in Norway. Additionally, reproduction data for the long-tailed skua, great skua and 3 common corvid species breeding in Norway are included. Data includes clutch size means, standard deviation of the clutch, fledglings per clutch, proportion fledged per clutch, clutch size range, breeding habitat and latitude.<br><br> All species are categorized as either a generalist, specialist or corvid. Literature was used to categorize the species and are linked to in the dataset.<br><br> The data was collected from literature and combined into a dataset. All species have reproduction data, and the individual references are linked to the dataset. The mean clutch size, standard deviation and number of fledglings were collected from different references while the clutch size range was mainly collected from the website Birds of the World.<br><br> The literature used in this study was selected based on three criteria: 1) The mean clutch size, number of fledglings and proportion fledged per clutch were measured during several years (minimum 2 years). 2) The data had many observations, and if several references for one species were available, the reference with the most observations was chosen. 3) If criteria 2 and 3 were achieved, data from studies conducted in the arctic tundra or boreal forest in Fennoscandia was preferred.<br><br> Google Scholar was used to find the references with the following search words: species name, clutch size, reproduction, arctic tundra, boreal forest