R.B. Hamilton 1965 Stercorarius pomarinus June 11 Barrow Alaska - Two Pomarine Jaegers in the light color- phase were seen flying at the airport. June 12 Paul deBenedictis told me that the ♂ can be told from the ♀ because he is whiter underneath. He also usually has a longer tail. In the field the birds can be separated into two groups but I have yet to see any behavior that would let me check on the accuracy of my sex identification by plumage. Some light-breasted birds that I thought were males had short tails. The density of Jaegers on the tundra are quite high. They are generally seen flying from place to place or sitting on the ground. The only type of display seen was a slow flapping flight which was made over the territories. Although most birds were on territories two groups at about 15 each were seen on the W side of Family Lagoon. Most Jaegers seen were of the light color-phase. About 5% are of the dark color-phase. Two Jaegers were observed fighting(?) over a Lemming. One Jaeger caught the Lemming behind the neck with its beak. The other Jaeger came flying when it heard the scream of the Lemming and grabbed the hind end of the Lemming. The birds pulled against each other, first on the ground-then in the air. The 2nd bird obtained the Lemming about 10 yds off the ground. It then flew away pursued by the 1st bird. It managed to swallow the Lemming quickly (in the air). June 13 An encounter between Jaegers and Snowy Owl was observed. The Owl flew by and landed. Two Jaegers flew at the owl during the last 10 yds. of its