Surnia Research Articles

Fledgling Northern Hawk-Owl at Weyakwin, Saskatchewan

Fledgling Northern Hawk-Owl at Weyakwin, Saskatchewan

Sex and Age Biased Mobility in Hawk Owls Surnia ulula

The distribution of sex and age classes of Hawk Owls in Norway outside the breeding season was analysed from 79 fresh birds and museum specimens. The tendency to move from the breeding range down to the lowlands was most pronounced in adult females, less so in juvenile males, and least in adult males and juvenile females. A combination of social dominance and competition for breeding territories may account for this distribution pattern.

Additions to Austin's "The Birds of Korea"

Surnia ulula is a summer resident in Shajitsu Mountain, Hangyong Nando so not only a straggler; Nucifraga c. macrorhynchos is a resident in Kongo Mts., Kangwon-Do; Dryocopus m. martius breeds Eiro Mts. and Hakuba Mts., in Kangwon-Do and the young was caught; Dryocopus richardsi were observed at many occasions from Yuten Temple to Shorin Temple in the Kongo Mts.; more than ten individuals of Lyrurus t. ussuriensis were observed at Maka Temple; several of, Grus virgo were observed at Koka I., Kyonggi-Do; at the sea-bird colony of Ran I. in Kangwon-Do Uria aalege inornata, Uria carbo, Cerorhinca monocerata, Synthliboramphus antiquus, Phalacrocorax p. pelagicus, Chaetura c. caudacuta were breeding, two speceis of Uria and Cerorhinca being their southernmost range in Korea; Lyrurus breeds commonly at Nojido, east side of the Taekto Mt.; a specimen of Columba j. janthina from Dagelet Is. constitutes the first record from Korea; the route from Wonsan to Seoul is a winter quarters for swans and cranes; southernmost records in Korea are Cuculus micropterus from Kyongi-Do, Tetrastes from Chunchong Pokdo, Athene noctua from Hwanghae-Do, Nyctea from Chungchong Nando and Platalea from Kyongsang Nando.