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118
Mixed Diglossini, Aug. 24, 1965, II

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flies away. A second later, a bird which undoubtedly is Laf ✓ appears in the area just vacated! Also silent and alone. This must have been a case of "trespassing". Humer going into Laf territory while owner is not around. Then leaving as soon as it sees the owner approach

8:40 am. More Laf Song. NODWA.

Leaving 8:55 am.

[[left margin]] Gen [[/left margin]]
COMMENT: I suppose that all the variations in inter specific behavior here may be explained most simply as the results of variation in the strength of hostile motivation. All the characteristic features of the behavior of the birds this morning could be explained by the fact that they were not very highly motivated (i.e. "suppressed" by rain and fog).

Going to work on Guadelupe this afternoon. At the lower place where I worked before (on previous trips). Arrive 3:18 pm. Partly sunny partly cloudy. But at least dry.

[[left margin]] Cy [[/left margin]]
5:12 pm. Down by road. A group at last 4 Cys ✓✓✓✓ ✓✓✓✓64 flies by.  Going from bush to bush along edge rock slide. Moving very rapidly. Uttering "CN"s. Group includes at least 1 juv. and 1 adult. Apparently quite alone.

[[left margin]] Laf EC Laf EC [[/left margin]]
A few seconds later, see single Laf ✓ ✓65  (identification definite) engaged in dispute with a green hummingbird. Haplophaedia or Eriocnemis Hummingbird definitely the  aggressor — altho it is appreciably smaller than the Laf. Laf perched silent 2-3 ft up in scrub. Hummingbird Swoops at it repeatedly (at least 20 Swoops). "Pendulum" Swoops, from one side to the other. Both birds silent. Laf finally flies off. And hummingbird in hot pursuit! (I didn't get a good enough view of this hummingbird in good light to be able to identify it. Apparently all dark — except for very large and conspicuous white leg

Transcription Notes:
'ly' at beginning part of 'suddenly' on previous page - omit here With the checkmarks, they appear twice for each count, the first set in regular pencil and the second in blue pencil, which is why the checkmarks do not equal the number of birds counted. I originally thought I was seeing the word "Hummer" short for hummingbird, but turns out it's Humer for Diglossa humeralis