Eurasian
Curlew are one of the commonest and regular waders during the spring
migration, with a peak in the first half of April. Return migration
starts as early as mid June and lasts well into October. Occasianl
birds during the winter months probably refer to birds attemting to
overwinter.
The occurrence pattern of this species at Utsira is very
similar both in timing and numbers. The large numbers at Stag
Rocks in Northumberland stop immediately before the migration starts at
Skogsøy.....
The blue line shows number of visits, the orange one the number of
visits when Curlew have been recorded and the green one
(numbers on right hand axis) shows the average
numbers I have recorded in any three day period.

Maximum: 114, Early April 2006
Eurasian Curlew, September 2007
References
Tveit,
B.O., Mobakken, G. og Bryne, O. 2004 Fugler og fuglafolk på
Utsira. Utsira Fuglestasjon
Website: Fugler
i Hordaland - Skogsøy i Øygarden