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121

Mixed Diglossia, Aug. 14, 1965, III    

[[left margin]] Coer [[/left margin]] 

But some phrases are rather different. Some include Twitters which are very much longer than usual. And at least once, the bird utter a phrase which consisted of a moderately long Twitter (ending in usual "Slur"), without any Intro Notes at all.

[[left margin]]  Cy [[/left margin]] 

Then bird falls silent momentarily.  And I hear what hears to be Cy song phrase not far away! Long rapid twitter (with a pronounced high, then, "eeeee" quality).  Probably introduced by a couple of "Tut" Notes (but these must be soft - like the comparable notes in some Cy songs in the Sierra de Mérida).  This Cy may be bird with mixed flock seen a few minutes earlier. Then Cy shuts up. Coer resumes singing as before.

[[left margin]]  Coer Cy [[/left margin]] 

Then mixed flock shows up in scrub below Coer's tree. Coer seems to disappear at approximately same time.  Certainly does not join flock.  Flock includes Yellowfaces, which sing from time to time. Also, probably, Cy. At least, I hear more presumed Cy songs in the neighborhood, at irregular intervals.

[[left margin]]  Coer Cy [[/left margin]] 

At no time, during these incidents, were there any overlaps between the songs of the Coer, the presumed Cy, or the Yellowfaces.

This area is slightly above the highway where I took my altitude measurements early this morning - but not more than 100 ft.

[[left margin]] Cy  Coer [[/left margin]]

COMMENT:  The relations between Cy and Coer are still puzzling. Or, rather, still appear to be remarkable. It would appear that there is less ecological segregation between Cy and Coer here than on Munchique. (In this respect, of course, the two species conform to the general rule.) At the same time, it would appear that the songs of the two species are at least somewhat less distinct here than on Munchique. Is this to help to keep them "apart"??? Is the situation here much the same as in some other parts of the Andes, e.g. the Eastern Cordi