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Puerto Annuelles, July 21, 1967, VI 28
at all plaintive in tone. Uttered singly or in short series. 1 to 5 notes. Most frequently 3 notes. Next most frequent type of performance is a single note. The vocalizations of the captive produce an immediate reaction! All or most of the wild individuals begin to utter Whistles, single notes or short series. Notes themselves quite like those of the captive. Series organization probably also similar in series organization.
These Whistles obviously are a form of Lost Call and presumably strictly homologous with the "Lost Calls" of Aotus Saguinius, Cebus capucinus, and infant Alonatta. Presumably also homologous with some of the Whistles of Callicebus. But thy are peculiar in at least one respect. Apparently not released by isolation alone. Only released by vocalizations of other individuals. And presumably usually or always hostile vocalizations. (This might represent a "primitive"  stage in the evolution of a "Lost Call".)

GENERAL NOTES: BURRICA PENINSULA
According to Della Serra, both sides of the peninsula receive approximately the same amount of rainfall. But the Panamanian side looks as if it might be slightly drier on the average. In any case, it has been very largely cleared for pasture land. The Costa Rican side, by contrast, has very large stretches of very impressive forest. Several types. Rather low forest for a few hundred feet in from the beaches. And then beautiful tall forest further inland. Both obviously are very