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EANHS Bulletin 30(1) 
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timo of day 
Figure 2 Temporal distribution of Great Calls of captive Denarohyrax arboreus. 
during the rains (Mrs Jacobson, pers. 
com ) Richard (1964) and Kingdon 
(1974) also heard more calls during the 
dry season 
Other sounds 
While the Great Call is the best known, 
there is a large number and variety ot 
other sounds produced by the hyrax in 
this study. 
Contact sounds or those with an 
unknown stimulus 
Glucksing 
This is a soft ticking made when 
exploring new objects, soliciting 
offered foods, and upon entering the 
observation room. It was produced 
most commonly by the aduli female . 
especially when accompanied by 
young. It was rarely made by the male 
and only after he had been in captivity 
for some months The young make it 
early, but rarely Perhaps it is for 
reassurance 
A forming 
A single low murmur, it is only made 
by the adult male, either when 
approaching the female luring 
courtship, or in response to a plane 
flying overhead. The mouth is slightly 
open, head slightly raised and Hanks 
heaving. 
Soft twitter 
This is a succession of soft tremulous 
sounds uttered hv juveniles when 
approaching or being approached by 
others. The young make it when 
soliciting suckling The upper lip is 
lifted, the mouth closed and the lips 
