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A bstract : The breeding biology of the Faroese house sparrow ( Passer domesticus ) is described based on the results from nestlings that were ringed just before they were fledging. By means of dates and numbers, the beginning and duration of the breeding seasons are determined and the reproductive output is estimated. Our study has shown that Faroese house sparrows produce two, occasionally three, broods annually. Overall, eggs of the first, second and third clutch are normally laid in the beginning of May, in the middle of June and in the beginning of July, respectively. In a season, a female produced 6.3 nestlings, on average. For the whole period, the average brood size was 3.5 nestlings. During the first part of the time series (1985­1989), the breeding season became earlier each year, but then to be later again in the years 1990 to 1992. The first clutch was laid more than five weeks earlier in 1989 than in 1985 and the second clutch almost seven weeks earlier. Urtak : Arini fra 1985 til 1992 voru tilsamans 347 graspurvaungar ( Passer domesticus )  merktir i bygdini Nolsoy, beint aðrenn teir voru floygdir. Við at nýta dagfestingina ta ungarnir vorðu merktir og talið av ungum er asett, naer og hvussu ofta graspurvurin verpur og hvussu nogvar ungar hann faer hvorja ferð. Kanningarnar visa, at foroyski graspurvurin verpur tvaer ferðir um arið, viðhvort to triggjar ferðir: Fyrstu urptin er i byrjanini av mai manað, tann naesta er um miðjan juni og triðja urptin i byrjanini av juli manað. Hvor boga faer i miðal 6,3 ungar um arið. I miðal voru 3,5 ungar i hvorjari urpt. Urslit okkara visa, at tey fyrstu arini varp graspurvurin fyrr og fyrr, fyri hvort arið. Hetta broyttist to tey seinru arini sum kanningin vardi: I 1989 vorðu fyrstu eggini vorpin meira enn fimm vikur fyrri enn i 1985, og naestu urptin naestan sjey vikur fyrr.

Breeding biology of the house sparrow (Passer domesticus) in the Faroe Islands / Nøringin hjá føroyska gráspurvinum (Passer domesticus)