OMANI HMOKhWN 
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CONTENTS 
INDRODUGRION: 1 page 5 
THE CATEGORIES OF BIOLOGICAL SOUND... 6 
PATTERNS OF OCCURRENCE. ..28 
DISCUSSION... 33 
CONCLUSIONS... 39 
REFERENCES... 41 
ILLUSTRATIONS 
Physical description of the cyclic Click Chorus...pages®@, 9 
Physicaldescription of the Rhythmic Grunt... 72, 73 
Physical description of the Motorboating sound...14, 15 
Physical description of Barking...16, 17 
Physical description of the Growl... 18, 19 
Sonagrams of the Low-Frequency Groan...20, 21 
Sonagram of 20 c/s Long Pulses... 22 
Sonagram of 20 c/s Short Pulses... 23 
Sonagrams showing 20 c/s Long and Short Pulses plus some 
other sounds with different degrees of time com- 
pression... 26, 27 
Diurnal distribution results for three sound categories, by 
presence within a sampling... 29 
Diurnal distribution results for three sparsely distributed 
sounds, by presence within a sampling...30 
Diurnal distribution results for low-frequency sounds, 
based upon mean count per sample... 32 
Ambient noise spectra for specific hours of peak ambient 
level, including comparison of Rhythmic Grunt 
Spectrum with peak ambient spectrum at deep hydro- 
phone (2300 hours)...34 
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