Catheracta macroura Arrived skuzzy for observation 3:35pm. At Yw-Or at mound. Left Yw Or joined at 5 minutes late. Latter then walks & spots N of me - is swooped at by 4ft p230 ( < 1946) 3:50 Left Yw-Or leaves toward roobery. Flew back to mate on mound a few minute ago. Has been out of sight on far side of mound. p230 - p2 announces. Only 4ft Yw-Or raises wings Shew flew one, it something, egg I think, in bill - being mobbed by 4 others - they followed him 'til he landed on bill & mobbed him on ground also. Noted individual to W of me - give challenge. Definitely put bill on breast as he began display then raised head as he raised wings another time he stood so if to challenge put bill on breast & then stopped. 4:12 A good aerial display. Two individuals flying, gliding & diving together, one landed on slope high, second landed near a bird which displayed & chased it. Attempted again then another, a third bird flew up, they circled out & glided together. One then landed below the other finally landed right to another line