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Mixed Diglossini, Apr. 18, 1965, III                   [[circled]] 9 [[/circled]]

Fog coming in 6:10am!

[[left margin]] 77 [[/left margin]]
6:16. Well! Well! Two nigrocristatus ✓✓ suddenly appear. Hopping about in lower part Primes.  Also Scrub below Primes. Apparently fighting with one another. Lots of chasing back and forth. Some Rattles and Flourishes. Some St Postures?

[[left margin]] Humer [[/left margin]]
I think one of the Humers attacks or supplants a nigrocristatus. If so, Humer retreats again immediately.

[[left margin]] Humer 79 Coer [[/left margin]]
6:21. There are a couple of Humers ✓✓ feeding in low scrub slightly uphill from Primes. Prime areas where Coer(s) seen on earlier days.

[[left margin]] Humer Gen [[/left margin]]
Are Humers (or Black Diglossas in general) particularly likely to attack Coers and juv. Cys because both are dull enough to be slightly reminiscent of juv. Blacks?

Fog really is too thick to do anything now 6:30 am.

Go on down to area where presumed Laf and pair of Humers seem to be holding territories, occasionally, apart from Primes. There are thrushes, Zonotrichias, and hummingbirds around; but apparently no Diglossas. All gone to Primes because of fog?

[[left margin]] 80 [[/left margin]]
6:39. Fog lifts a little. And a single Black Diglossa ✓ flies into original Humer area trees! Coming from direction of Primes! Thin fog thickens again, and I lose sight of the bird.

[[left margin]] Gen [[/left margin]]
It is quite possible that Lafs, like Coers and Cys, spend relatively less time in the Primes than do Humers.

[[left margin]] Laf Humer [[/left margin]]
A thought has just occurred to me. Perhaps the presumed Laf here is not singing because there are no other Lafs around, or no other Lafs singing, and the Humers are not singing either. This would indicate that Laf Songs are provoked by other songs, not