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19

Aramides cajauea, I 
      
July 2, 1960
Barro Colorado

I just happened to look into the cage where the 4 birds were, and saw WR performing "Tail-cocking" Movements ("ck"), just like those of adults.  At least 7 or 8 of these movements, in more or less rapid succession. Both when standing still and when walking slowly around the cage, apparently looking for food.

These ck Movements seem to have appeared fully-formed completely (?). Certainly not a case of ontogenetic ritualization. 

It may be significant that the tips of the tail feathers (and the primaries and secondaries of the wing) are now fairly conspicuously free of their sheaths.

Aiamides cajauea, I   

July 5, 1960
Barro Colorado

Started to watch and experiment with the birds around 7:30 this morning.

Spending a lot of time more or less huddled together in their cage. Occasional periods of walking around and feeding.  They still seem to be quite gregarious inter se, but it is not uncommon to see 1 or 2 birds get up to feed by themselves without being followed by the others.

Their wing feathers are developing quite rapidly.

They still utter lots of Peeps in their cage. When huddled together and (perhaps more frequently?) when walking about in a more or less scattered way. All or almost all their Peeps are relatively long and plaintive-sounding. Exactly intermediate between short Peeps and typcial