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[[circled]] 2 [[/circled]]
[[underlined]] Ateles fusciceps [[/underlined]], Oct. 2, 1958, II

[[Image left margin - three vertical lines and a rectangular hashed section in pencil ]]

Actually I have seen relatively little Hdd by an isolated animal because the two are almost always Hdd-ing together. Then they clasp one another very tightly (Cl) and wrap their arms around one another very tightly. S usually tries, and succeeds, in getting its head under some part of L.
In general S has been much more prone to Hdd and Cl than L. This would suggest that the whole complex is essentially infantile.
Sometimes, if L starts to move away, S will continue Cl and be carried on L's back for a short period. (L usually has to break away from S by "main force" anyway.)
I wonder how this Hdd-Cl complex is used in the wild when an  infant has a mother present???
If L moves away from S, S usually follows it, very slowly, and usually utters high pitches squeals. Usually single, sometimes repeated; sometimes, perhaps, organised into little series of 2 or 3. Doesn't really seem to get any response.
In general, both animals seem to move remarkably slowly, particularly when alarmed. Absolutely the quintessence of cautiousness in appearance. (The only time I have seen either move with any speed at all is when L gets annoyed and starts Barking - see below).
If S is picked up in the hand, it usually utters one or more single, long drawn, shrill, uniform, rather whining shrieks. Obviously analogous, and probably homologous with the screams of Night Monkeys, and probably also the K of the Puiche's.