In the evening of the first day of observation, the female together with her two young was on land. The male was swimming approximately 200 feet out on the lake. The female was shot as she was flushed from the bank. The largest ovum was four mm in diameter. On the morning of the second day (15 hours after the female was shot) the male was observed tending the young; one young was by his side and the other had wandered to a point 40 feet away. A parasitic jaeger came and hovered above the straying young loon and then dived vertically to seize it. The male loon was too far away to reach its young before the jaeger departed. As the jaeger was leaving the area, three other parasitic jaegers pursued the first in an attempt to wrest from its beak the young loon. The contest for possession of the young loon continued as far as the eye could follow the contestants. On August 2, at 3:35 P.M. the surviving members of this loon family--the male and the one young--rested on the water of the lake, approximately 200 feet from shore. The adult dozed with its head tucked under its wing--head end oriented into the wind except for occasional complete turns. These were made without visible change of posture. The young one alternated by swimming around its parent and resting at which time it tucked its head under its wing. Toward evening, the male was shot. A survey of the area the following morning disclosed the absence of the young loon, not to be seen again during our stay. It was noted that during our sojourn of seven days, when the male was left with the orphaned young, the parent would fly to Teshekpuk Lake some 1-1/2 miles to the south to procure food. The young loon when left alone would dive under water when approached. On August 4, a pomarine jaeger pursued the male loon as it was returning from fishing on Teshekpuk Lake. When the birds first were seen, the jaeger was approximately 200 feet behind the loon, but in a distance of approximately 300 feet the jaeger overtook the loon which had reached the shore of Barrier Lake. When the jaeger was ready to strike in order to make the loon drop the fish it was carrying, the loon dropped over the erosional cliff and splashed into the water. After 30 seconds of hovering over the submerged loon, which remained under water for one minute, the jaeger departed to the west. The loon came to the surface holding the fish tightly crosswise in its beak.