“…These sounds are considered to be a means of communication and closely related to the vital functions such as hunting, feeding, and mating (CARPENTER, 1924;KARTMAN, 1946;VANDERPLANK, 1948;KOLBE, 1971KOLBE, , 1973ERICKSON and MOLLER, 1976;POPHAM et al, 1978). These sounds are considered to be a means of communication and closely related to the vital functions such as hunting, feeding, and mating (CARPENTER, 1924;KARTMAN, 1946;VANDERPLANK, 1948;KOLBE, 1971KOLBE, , 1973ERICKSON and MOLLER, 1976;POPHAM et al, 1978).…”