Tern is the commonest species of tern observed at Skogsøy and
the largest numbers are recorded during the spring; often in the second
half of May. The species is seen regualry throughout the summer and
well into September; occasional birds are seen into early October.
The occurence pattern for this species seems very similar to that of
The blue line shows number of visits, the orange one the number of
visits when Arctic Tern have been recorded and the green one
(numbers on right hand axis) shows the average
numbers I have recorded in any three day period.