Lehner P. 1964 Dec. 11 today was our Friday guywire census; Doc took the A.M. and I had the P.M.; at 12:30 at Sooty Tern flew over the island calling - the first I'd seen over the island in the daytime; 3 Red-tailed Tropicbirds called and swooped low over the island; an adult male Great Frigatebird pulled at Tribulus runners - I have not seen any Frigates work on the runners from the ground, but always swoop down and grab a runner trying to pull it loose - I walked one adult male twice carry Tribulus runners out of sight NW of North Island; many of the male Frigates are displaying throughout the day.