15 Auk 1946 Croke^ Day. Dev on At on e point a l ong the 
beach I heard a great furor of screening at two pitches. 
One I recognised a bein g a jaegnr-Tmdthe other, -when 
T finally .saw the birds, proved t o be a lar ge shore- 
bird. The jaeger and the shorebird alternated chasing 
each "other, each pursuing his adversarv^vittf-ab out 
eonal rifit,smi n- ti on . 
Finally the jaeger-(parasitic) 
lit with his mate beside one of the lakes while the 
shorebird lit on a growler" just "off shbreh'/itlT some 
Arctic terns. —X— had observe d a—1 this at-.a distance 
of over half a mile, so it was not until I came closer 
that the shorebird was identified with certainty as a 
black - b e lli e d - plov e r. — I am not s ure - whet ner it was 
nesting in the vicinity or not, tho it became mildly </■ 
excited when I approached the area where it was chasing 
th e jaeg e r - . — then coH -e et ed^—i t pro ^vod-to-be an adult 
just beginning to molt to the winter plumage. 
