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[[circled]] 60 [[/circled]] 
Mixed Diglossini, Apr. 18, 1965, IV        

[[left margin]] Laf Humer [[/left margin]] 
the mere sight, or even close presence, of an "enemy" (for, after all, the "Laf is treating the Humers as "enemies".) At least, this may be the case during the non-breeding season (in the breeding season, it may be different). 

[[left margin]] 81 Laf Humer [[/left margin]] 
Back to Primes ✓, 6:53. To find fog temporarily lifted here. See what looks like Laf repeatedly (6-8 times) supplant and chase an undoubted Humer. With "Zraaa" Notes! 
Fog in again 6:58! 
Walking around again. 
Pass Primes again 7;12. Quite impossible to see anything. But lots of "Zaaah" or "Zraaa" type notes audible. 

[[left margin]] 83 [[/left margin]] 
7:15. Hear and see a pair of B. nigrocristatus.✓✓ In bamboo scrub. very noisy but apparently alone. This species certainly fills the bamboo scrub niche here. Compare with other species in Bolivia (Possibly one of the reasons that nigrocristatus is not more important in flocks here is that other species don't like bamboo???)

[[left margin]] Humer 88 [[/left margin]] 
7:26. Back to Primes. Fog lifted temporarily again. Lots of Humers ✓✓✓✓✓ flitting about and I see that one bird which seems to be uttering lots of "Zraa". Notes looks like an adult Humer. Some, at least of the "Zraa"s seem to be uttered when the bird is alone. Without ritualized postures or movements. Surely this bird must be young? 
Fog back again immediately. 
7:50. Fog lifted. 

[[left margin]] 89 Laf [[/left margin]]  
Go down to area where presumed Laf and Humers were holding territories. See Laf ✓ feeding in original Humer trees. Laf identified definitely. Humeral patches are blue, not grey. 

[[left margin]] 91 [[/left margin]] 
Pair of Firebellies flies by. Noisy but alone. 

Transcription Notes:
Basileuterus nigrocristatus