MacLean 1966 from the Medoe. Spent some time talking our things there - all is well and proceeding normally. After midnight Mike checked nest #138 and found that a bird was sitting on it; no more tenuincki. Went out and shot it - a ♂. Presumably the mate of the ♀ removed earlier. The other nest was vacant and cold. The best explanation may be long (ca. 12 hours) incubation sessions for each member of the pair, with the non-incubating bird leaving the area rather than standing sentry duty. This could be related to the exposed nest - a sentry bird attracts attention as well as alarms the other bird. The situation, however, is far from completely revealed. 19 July Barrow Alaska Slept late, then spent morning sexing and looking at stomachs of yesterday's baird's plus trapline kills. After lunch went out into drum area in rainy, misty weather to look for baird's with young. The nest that Mike watched (# ) has hatched out - 2 young still wet. Backed off and watched it for an hour - saw only 1 adult in the area in that time.