June 10 cont. - culmen growth on Kure Island. Steve says that according to the data they gathered in 1965? one can tell within ±4 days, the age of the chicks by having a statistical sample of culmen lengths (stat. sample = 30 at least). Our measurements were in mm. (from base to tip). Laysan chicks: 97.5 95.3 105.3 98.4 100.7 109.9 104.5 109.8 101.1 104.5 103.2 109.7 104.0 111.5 104.1 92.0 98.9 103.1 99.0 103.4 109.3 102.8 99.9 112.0 105.6 106.0 90.4 102.0 105.3 102.1 Black foot chicks 102.1 101.0 94.7 102.9 98.1 99.9 104.1 108.8 99.7 105.7 103.5 97.4 104.0 95.2 108.1 106.0 100.7 97.9 101.4 104.6 100.7 106.4 104.5 100.1 107.4 97.3 105.1 95.4 103.0 106.7 At night I set out along the shore to band Christmas Island Shearwaters with DeLong. The others took off to band Palau's Petrels. We also took egg floatations and noted brood patch condition. Christmas birds were small in number as only 46 were banded - all along the rugged shore, where we were the Palau's were extremely abundant, under rocks, on top of them - calling 'woof woof' etc. Bob and I witnessed a scene of territorial behavior over a nest site under a rock. Apparently 2 males (guers) were engaged in combat. They rolled around biting each other - subduing beaks in their fury. They even stood up on "tip toes", leaning against a rock like struggling cowboys, finally falling down. After 5 minutes or so of bullying and puffing and scratching and biting one bird took off and wandered about 3 ft away. The victor walked around that seemingly regaining his composure and went under his ready won home. I placed the loser under the victor's rock, but he immediately flew away. Then flew.