Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
SPLWays
1975
Stercorarius pomarinus
Britton area, 1 km W of NAPL, Pt Barrow, Alaska
10 June
-1035 watched hunting sequence in jaeger: bird had already landed, was tearing apart
vegetation with its bill; not too actively, but once every 4-5 seconds it would
grab some + throw it aside, then would be about. some flurry of activity. another jaeger
flew in (RAP thinks original was 8, second 9) only to be attacked + chased away - it flew
~75 m + landed. then original jaeger caught a lemming, handled it for less than 5 sec,
and flew over to the bird which it had just chased away: the second bird, after what looked
like a grapple, threw at the lemming. However before the two were finished their bout (within
20 seconds) 5 other jaegers piled into @ their vicinity.
Grid 2, N of Smithsonian building, Pt Barrow, Alaska
12 June
3 jaegers over grid at 0910 when we arrived, one displaying: a gliding flight
with wings in dihedral
followed by a series of flaps (continuous)
with very shallow wing beats during which the tips of the wings are kept
above the plane of the body
pair
1225 jaegers displaying on ground, walking vibrally toward one another, walking parallel
within 2 ft. wings lowered, tail raised, neck arched.
[illegible]
proceeding in circle ?) in radius of less than one foot. 8? (w/out breast band)
posture is now
jaegers
Scratch
@directly
walking in short waddling
extreme exaggeration
thrusting out of chest