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[[underline]] Alouatta palliata [[/underline]], I November 13,1959 Barro Colorado

Haven't had much chance to watch the animals lately, what with being away in Europe so long, and being so busy since I came back.
C died recently, after being sick a very long time. Worms?
Y was very sick for a while; but now seems to be [[?]] (It developed a traumatic cataract some time ago - presumably as a result for some early injury - but doesn't seems to be bothered at all by it.)

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Y, X and Z are all in a large outside cage by themselves now. 
Y's behavior seems to be much the same as before. Same range of calls; (although I haven't heard it give Mu for some time now - probably because I don't carry it much now.)
I have noticed that all 3 animals now give ab-type B early in the morning when they are hungry and waiting for their food to appear. This must be significant - at last in the cases of X and Z (it is always possible that Y is just reacting to my absence at any time) Means that the ceb-type B is definitely a generalized distress call, as X and Z all completely fixated on each other and their gregariousness and / or infantile motivation cannot be really frustrated as long as they are together.
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[[underlined]] Alouatta palliata, [[/underlined]] I

July 10, 1960
Barro Colorado

Unfortunately, an epidemic carried off all my Howlers, one by one, except Z. Z, however, is flourishing exceedingly. (Z = "Bully")