Barn Owl

Tyto alba

Slørugle

Slørugle

Short abstract from the book:
The Danish barn owl population decreased to 20-25 breeding pairs in the late 1980s, but has since increased to 225-250 pairs in 2003. In Denmark the first barn owl was ringed in 1921, with the highest number ringed in 2002 (358). Most of the recovered birds were ringed in southern Jutland. Ninetyfive per cent of the recovered birds were ringed as chicks, all from 16 May to 21 November. Barn owls ringed as chicks have on average travelled 42 km (0-689, n=181) from ringing to recovery site; 24 % were recovered more than 50 km from the ringing site. The 24 birds that were recovered from abroad (Germany, Sweden and Poland) were all ringed as chicks. The recoveries indicate that most first-year birds disperse in September-October. However, there seems to be a considerable difference between birds from early and late clutches in the distances travelled in the first year: birds ringed in May-August were recovered an average of 47 km from the ringing site (0-689 km, n=132), whereas birds ringed in September-November moved only 3 km (0-35 km, n=19). Birds ringed as chicks and recovered in a subsequent breeding season were found on average 44 km (0-152 km, n=38) from the ringing site. Five per cent were found more than 152 km from the ringing site. Several foreign barn owls have been found in Denmark: 134 from Germany, four from the Netherlands, one from Belgium and nine from southern Sweden. The majority of the foreign birds were found in Jutland, but 22 were found east of the Little Belt. The longest distance was travelled by a bird ringed as a chick near Stuttgart in Germany in June and found seven months later at Skagen in northernmost Denmark (983 km N). A large invasion took place in 1990- 91: 58 birds ringed abroad were recovered in Denmark in 1990-92 and 79 % of these were ringed in 1990 (some as far away as southern Germany). A smaller invasion probably took place in 1993-94, with 17 birds ringed abroad in 1993 subsequently recovered in Denmark. All birds in these invasions were ringed as chicks. Twenty per cent of the recoveries were live recaptures. A relative large proportion of the dead barn owls were found dead in buildings or as road kill.

Read more about the species in the chapter from The Danish Bird Migration Atlas here

Ringing data for Barn Owl

 
Datavisning: genmeldinger    genmeldinger/mærkninger    mærkninger
Sæson: alle    vinter    forår    sommer    efterår
Periode: alle    før 2003    2003 og frem    seneste 365 dage


Data

Birds ringed
Birds ringed 7.560
Ringed as chicks 0 (0,0%)
Recoveries
No. of recoveries 1191
No. of individuals 0
Proportion recovered 0,0%