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(?)major, (underlined)Apr. 9, 1960, II   19

ed on my face. "She" probably thinks she is sitting on a branch next to me.)
  Just by chance, I happened to utter a high-pitched "Cooooo" sound when I as standing over both M & Hrr, and M began to react in a very distinctive way. They both began to perform Tsh's. The longer and louder my notes became, the more Tsh's they performed. Their Tsh's also became more vigorous when my notes became longer and louder. Then they began to perform quick, brusque, "erratic" preening movements when I continued the notes. Their preening movements looked very much like displacement. They were sometimes disoriented. M, for instance, several times made rapid preening swipes at Hrr (and I have never seen any trace of mutual preening movements in these birds before. At about the same time they began to perform their preening movements. Frequently, they also began to perform "retching." A bird would (?) gape, usually when its neck was stretched slightly upward (as it almost always was during the whole course of this experiment), and their quickly stretch the neck diagonally forward, keeping the bill wide open, and keeping the head pointed diagonally downward, in what looked very much like an attempt to vomit. A bird seldom or never remained 


  [image of a bird with its mouth wide
   opened]  Sometimes head further
            forward and lower

in their "retching" posture for more than a second or so,but it was